Seresto Collars for Dogs

Everything about Seresto
This in-depth explanation will provide you all of the essential information about Seresto dog collars and guide you to make the most informed decision about the leading flea and tick guard for your dog.
Seresto dog collar banner 8 months protection
Explore this detailed guide to determine why the Seresto dog collar is the best choice for long-term flea and tick prevention for your canine friend. With a scientifically proven formula, the Seresto dog collar can provide immediate coverage from pests and the harmful diseases they may carry.

What is the Seresto Dog Collar?

Seresto has developed an innovative form of flea and tick repellant in the form of a dog collar which applies two crucial active tick and flea repellents over the surface of your dog’s hair and skin.

The active ingredients offer dogs with long term pest coverage, lasting up to eight months at a time. The innovative compounds and design of the dog collar make for a mess-free and easy application process.

Pet owners no longer have to deal with monthly treatments that leave strong odors or greasy hair and skin. The collar is odorless and provides a no-grease, long-lasting coverage of skin and fur.

Along with these amazing protection benefits, Seresto is also extremely safe to use. The collar is designed with a cutting-edge ratchet release mechanism and a designated breaking point that will ensure your dog will never get caught by the collar.

It protects against

flea vector


tick vector


How does the collar work?

Seresto large dog collar Seresto small dog collar
Dog Weight (lbs) Over 18 lbs (8 kg) Under 18 lbs (8kg)
Collar Weight 7.53 g 1.81 g
Imidacloprid 10% (100 mg/g) 10% (100 mg/g)
Flumethrin 4% (45 mg/g) 4% (45 mg/g)

After putting the collar on your dog, the effects of the active flea and tick preventative compounds will activate immediately. Instead of resorting to a monthly treatment method, these dog collars are designed to prevent fleas and ticks with the sustained release technology that protects your pet for up to eight months. 

Across eight months of effect, the active ingredients of Flumethrin and Imidacloprid release a low concentration over your dog’s skin and hair. The patented technology of these collars has made the Seresto dog collar the longest-lasting single use flea and tick prevention method available

Experience advanced features such as:

  • Eight-month duration that can provide year-round and all-season protection
  • Durable form featuring a waterproof design
  • Sustained release of pest repellent compounds for long-term protection
  • Compounds kill pests on contact rather than having to bite the dog to exterminate
  • Kills ticks and fleas immediately within 24 hours of application
  • Inclusion of active 10% Imidacloprid and 4% Flumethrin ingredients
  • Sustained release polymer matrix ensures your dog is covered for up to 8 months

Active ingredients

On top of the stylish appearance, the collar is formulated with active ingredients to repel pests such as lice, fleas, and ticks from latching on to your dog’s skin and hair. The Seresto dog collar has two main ingredients that are actively protecting your dog from unwanted pests.

The 10% (100 mg/g) Imidacloprid and 4% (45 mg/g) Flumethrin are the two active ingredients included in the Seresto dog collar to fight fleas and ticks.

These two ingredients have been scientifically researched to ensure that the perfect levels of Imidacloprid and Flumethrin are present in the dog collar.

These levels ensure that the dog collar protects from fleas and ticks for up to eight months, while also protecting your dog’s skin and fur. The slow-release and spread of the two active compounds provide unrivaled long-term protection.

The combination of Flumethrin and Imidacloprid prevents ticks of all sizes and ages and will also combat flea infestations, killing fleas at any point in their life cycle.

If you are noticing that your dog is itching or exposed to a tick, it is a sign that the eight-month effective period of the dog collar is up. Be sure to keep a good record of what date you put the collar on your dog to be ready with the next collar after the eight months.


One of the most recently discovered compounds to protect pets from pests and illnesses is Imidacloprid. It includes traces of insecticide for safe application on the skin and fur of dogs and cats. It is a proven compound that can reduce flea and tick presence by 90% or more within a matter of days.

The chemical compound is especially effective at fighting and killing:

  • Fleas
  • Ticks
  • Lice

The qualities of Imidacloprid have been engineered to be effective against the nicotinic receptors of insects while remaining safe for use on mammals. The chemical compound of Imidacloprid is a fast-acting lethal chemical to insect nervous systems. There is a high toxicity to insects, while specifically developed to be extremely low in toxicity to mammals, such as dogs and cats.

The compound Imidacloprid was designed specifically to prevent fleas, ticks, and other pests from bothering your dogs and pets. Imidacloprid has grown in popularity in the veterinary field and has been included in many modern medicines for house pets and larger livestock. Imidacloprid has even been implemented in food production to prevent insects from invading fresh foods.

Along with the safety of your dog, the chemical compound of Imidacloprid and Flumethrin are both safe for human contact. This means that when the chemicals begin to spread across the surface of your dog’s skin and hair, it is still safe to hug, cuddle, and sleep with your dog.

Imidacloprid in the collar is designed to release gradually, contributing to the eight months of effectiveness of these collars. Combined with some of the passive ingredients and the additional leading active ingredient, Flumethrin, provides your dog with an invisible coating that will gradually span across their entire body, protecting them from pests and invaders.


While the effective compound Imidacloprid has been a more recent discovery in veterinary medicine, Flumethrin is a compound that has been improved upon for many years. With long-standing use as a pyrethroid insecticide, Flumethrin is a proven compound to prevent ticks, fleas, or lice from mammals.

Flumethrin is very safe for use on mammals and pets, used in a range of household pet medications as well as for larger mammal preventative medicines (cows, horses, livestock, etc.). 

Flumethrin works alongside the other active ingredient, Imidacloprid, to provide your dog with full-body protection against pests. The combination of the two active ingredients has proven especially effective at quickly eradicating pests from the surface of animal skin and preventing future invasions. Along with these preventative steps, Flumethrin can help prevent blood-borne diseases that come from pests, providing much more detailed protection of your pet’s health and safety.

The active ingredients of Imidacloprid and Flumethrin have been paired in Seresto’s groundbreaking dog collar to prevent fleas and ticks. Two GCP European clinical trials show that the combination of Flumethrin and Imidacloprid in the Seresto dog collar reduced tick exposure by around 90% and flea exposure to about 95%. These trials greatly supported the claims that the dog collars are effective for seven to eight months at a time, providing constant active defense. Flumethrin is designed to slowly spread across the skin and hair of animals over time to prevent infestations or kill pests on contact.

The combination of the two active compounds is unique to the Seresto dog collar, offering the longest-lasting protection of a single repellent treatment. The presence of Flumethrin and Imidacloprid on your dog’s skin and fur will ensure that ticks and fleas will be killed within 12 hours of contact.

Vs Other Brands

Alternatives to the Seresto dog collar repellent are topical or chewable methods. While these alternative sources offer some protection for your dog there are many downsides.

Seresto has developed a dog collar that provides the longest lasting coverage of a single application. The dog collar design means that your dog does not have to have sticky, greasy hair and skin from topical application or go through stomach and digestive complications that come from chewable styles.

Seresto Frontline Plus Bravecto Advantix NexGard
Type of Application Dog Collar Topical Chewable Topical Chewable
Single Application Coverage Duration 8 months 30 days 120 days 30 days 1 month
Prevents Tick and Fleas ✔️ ✔️ ✔️ ✔️ ✔️
Kills Ticks and Fleas On Contact ✔️
Effectiveness of Formula Die on contact Pest bite required Pest bite required Pest bite required Pest bite required
Tick and Flea Repellent Activation Time 12 hours 24-48 hours 24-48 hours 24-48 hours 24 hours
Mites ✔️ ✔️ ✔️
Waterproof ✔️


Seresto features active compounds that protect your dog from ticks and fleas, with additional benefits to combating lice. Dogs enjoy the outdoors; however, they are easy targets for pests. Ticks and fleas hide in spots waiting for dogs to latch on to. The proven flea and tick repellent formula ensures that your dog can enjoy the outdoors without the worry of becoming host to these tiny pests.

Here is a detailed look at the pests that the Seresto dog collar protects against.



Fleas are a leading pest to animals of all types. Especially present in warmer months or climates, fleas can be especially bothersome to your dog. Summertime often is the leading period of flea infestations, but if they have found comfort in your home, it is unlikely that they will go away in colder periods. Fleas will be found on the surface of a dog’s skin or latched on to the hair of a dog.

The best way to check for fleas is by checking exposed skin areas on the dog’s rump or stomach. These are the two easy to spot areas that will provide you with some basic knowledge about a flea infestation.

Life cycle of a flea

Fleas can be present on your dog during their entire life cycle. It is important to be able to recognize the four life stages of ticks. As they grow, fleas reproduce and multiply quickly on your dog’s hair and skin. Taking proper care of dealing with these pests at all stages will protect your dog from wide-spread flea infestation and the harmful effects they bring.

flea life cycle
1) Egg

Adult fleas can lay up to 40 eggs per day. Hatch time is dependent on many different conditions, but flea eggs can begin to hatch as soon as 2 days after being laid.

2) Larvae

The larvae hatch from the egg is the flea’s youngest living form. The larvae feed on flea feces and other organic substances that can be found on your dog, such as dead skin. After around five days, larvae will begin to construct their cocoons to enter the next phase of their life cycle.

3) Pupa

After entering the cocoon state, the fleas become a pupa. Given the conditions (weather, temperature) pupas can emerge as full-grown adults in a matter of days.

4) Adult

After emerging for the cocoon, fleas will immediately start to feed on your dog’s blood, hair, and skin. After a few days, female adults will lay a new batch of 40 eggs per day, starting the life cycle over again and spreading the flea population.

As you can tell, in the proper conditions, fleas can develop over just a week, multiplying rapidly across your dog’s skin and hair. It is crucial to take the proper preventative measures to ensure that your dog will not experience a flea infestation.

If your dog is showing signs of fleas before applying, try to treat the existing threat manually and let the immediate effects of the pest control formula protect your dog from future flea infestations and population growth.

The Seresto collar prevents fleas from invading your dog’s skin and hair. The flea repellent formula kills adult fleas on contact and restricts eggs from surviving on your dog’s skin and hair. Protect your dog from the irritation and harmful effects that come from fleas with the long-lasting preventative formula.

Location and Types

While fleas have been one of Earth’s pests for many millions of years, there is a specific type of dog flea that will attempt to find a home on the surface of your dog’s skin or hair. These dog fleas are found around the earth, in many different climates and weather types. As mentioned before, fleas are especially prevalent in warmer weather and in spring/summer months. Fleas are smaller than ticks, but still can be observed with the human eye. While it may be harder to feel for fleas, if you observe clusters of dark spots on the hair or skin of your dog, then your dog may have a flea infestation.

Flea eggs are often too hard to see, especially on the skin of your dog, but you can keep a watchful eye for clusters of eggs on strands of hair. As the flea matures, they grow in size, making it easier to spot groups of fleas on the surface of your dog’s skin or attached to hairs.

Be mindful to quickly treat flea infestations, as fleas are likely to jump off of your dog’s skin and can find homes in furniture or warmer parts of your home, causing a large issue to deal with.

To avoid widespread infestations, the collar provides the essential formula to instantly kill and prevent fleas. Lasting up to eight months, the collar will protect your dog and potentially you and your home with the dedicated flea-ridding compounds.

flea season
Fleas are found across the country but are present at different times of the year. This means, regardless of location, dog owners must be mindful of the peak flea season relevant to them.

Signs of a flea infestation

If you are trying to determine if your dog has fleas, check for some tell-tale signs of a flea infestation:

  • Continuous Scratching or Biting: Fleas will be moving around your dog’s skin and hair eating at them and causing an unpleasant feeling. Your dog may constantly be scratching their body orbiting at specific parts to remedy their discomfort.
  • Flea excrement: Fleas feast on the skin and hair of your dog, leaving behind excrement on the surface of your dog’s skin. This is a tell-tale sign that fleas are currently present. Removal of excrement is beneficial to preventing future growing fleas from surviving.
  • Live fleas around the home: If you find evidence of fleas around the home, you can most likely assume that they are coming from your dog.
  • Loss of fur: Scratching and biting can lead to excessive hair loss due to constant friction and baldness in spots.
  • Itchy, red, or irritated skin: The biting and scratching caused by itchiness can result in irritated, red sensitive skin that you will easily be able to notice.
  • Pale gum coloring: if your dog is considerably young or old, a larger infestation of fleas can result in heavy blood loss. The fleas will suck on the blood of your dog, resulting in loss of blood which is easily determined by inspecting the color of your dog’s gums. If the gums are paler, then the dog is experiencing a sign of a flea infestation.

Diseases carried by fleas

While fleas are a pest to your dog’s skin and hair, causing extreme irritation and itchiness, there are serious diseases that come from fleas that could influence your dog’s health.

Fleas can carry tapeworms, and if ingested, can be a vital threat to your dog’s nutrition and bodily functions. A single tapeworm will be relatively harmless to your dog and will be passed quickly, but larger infestations that result from mating can be extremely dangerous for your dog’s nutritional health.

If your dog is experiencing a larger-scale flea infection, it may be losing a lot of blood from these blood-sucking pests. If you notice irregularly low energy levels or tiredness in your dog, then they may be experiencing a case of anemia. Significant blood loss can influence many aspects of your dog’s body functions causing proneness to disease or lower energy levels.

Some more minor effects of fleas on a dog are irritated and dry skin, excessive scratching or chewing at skin and hair.

Flea prevention and treatment

As with tick prevention, there are ways to rid your dog of fleas after they have spread. What is most important is taking the preventative steps before a flea outbreak to keep your dog safe and healthy from any major health issues or irritation.

Using a Seresto collar will guarantee that your dog’s skin and hair are protected for eight months, offering immediate results. Fleas will be deterred from your dog’s hair and skin through the gradual release of Flumethrin and Imidacloprid that kills fleas and their eggs. Dogs will be covered completely from these pests and any disease or irritation that they may bring.



Ticks are a pest that can bother both dogs and humans. These annoying pests can be found in many different climates around the world, so it is important to constantly check your dog if they have been outside for an excessive amount of time. Ticks can latch on to any part of your dog’s body, so make sure to inspect thoroughly, including paws and ears.

Ticks will latch on to your dog to obtain a source of blood and then will remove themselves once they have received the blood they need. Through this process, ticks can spread dangerous diseases that can seriously harm your dog.

North America

If you live in the US, you will find that ticks are present in every state and climate. Ticks are present year-round, regardless of the season. It is essential to stay vigilant to ensure your dog is protected from the harmful effects of ticks. The collar works year-round in a variety of weather and seasonal types to provide

Ticks of a variety of shapes, sizes, and appearances are found across the US. When traversing in tall grass or wilderness, be especially mindful of checking your dog for ticks, as this is where ticks are most commonly found.

tick distribution map
Dog Tick (Wood Tick)
dog tick

Scientific Name: Dermacentor variabilis

Diseases carried: one of the most common ticks found in the wildness of North America. This type of tick is known to latch on to pets and humans, preying on the blood of dogs.

Distribution and Habitat: The dog tick is found in habitats with tall grass or trees. Dog ticks can carry harmful diseases, especially Lyme disease for dogs.

Deer Ticks
deer tick

Scientific Name: Ixodes Scapularis

Diseases Carried: The deer tick is the most common source of Lyme disease in the United States and Canada. These ticks carry the harmful disease which is transmitted through the bloodstream if the tick bites its host.

Distribution and Habitat: Found exclusively in the Eastern parts of North America. They will find places to hide with low exposure to light and heat.

Lone Star Tick
lone star tick

Scientific Name: Amblyomma Americanum

Diseases Carried: The lone star tick is known for being one of the most bothersome ticks. It is constantly on the move, looking for new hosts to attach to. While the lone star tick does not carry Lyme disease normally, there are other health complications, such as fever, that can come from these pests.

Distribution and Habitat: found mostly in the South East of the United States as well as Central America. The Lone Star Tick Will be found in wooded areas


Marsh Tick
marsh tick

Scientific Name: Dermacentor reticulatus

Diseases Carried: Marsh Tick (Meadow Tick): these ticks found in a variety of climates in Europe are known to transmit harmful diseases to dogs. Babesiosis is one of the leading diseases carried by this pest.

Distribution and Habitat: These are mostly found in grasslands or forests. Especially found in open grassy locations.

Castor Bean Tick
castor bean tick

Scientific Name: Ixodes ricinus

Diseases Carried: Castor Bean Ticks are Europe’s number one culprit for the spread of Lyme disease or Anaplasmosis.

Distribution and Habitat: These pests can be found in forests or wetter climates. Found mostly across Europe and some locations in northern Africa and Middle Eastern Countries.

Hedgehog Tick
hedgehog tick

Scientific Name: Ixodes hexagonus

Diseases carried: This is the primary tick that will be found attached onto dogs or cats in European countries. It is especially important to keep an eye out for hedgehog ticks on your pet because they are known to carry harmful pet Lyme disease.

Distribution and habitat: Hedgehog ticks thrive in a variety of climates and locations, so be diligent to check for these ticks. They can be found in hedges and or in your local parks across Europe.


Paralysis Tick
australian paralysis tick

Scientific name: Ixodes holocyclus

Diseases carried: one of the most dangerous ticks, or insects, in the whole world. The paralysis tick bite includes deadly toxins that can paralyze and kill its host.

Distribution and habitat: They are only found in Australia in forests and coastal areas.


Bush Tick
bush tick

Scientific Name: Haemaphysalis longicornis

Diseases carried: Bush ticks are not a major threat to pets or humans, as they normally feed on cattle or other livestock. These ticks are known to suck a lot of blood from their hosts, causing anemia.

Distribution and Habitat: These are found in the Asian-Pacific locations, found mostly in warmer climates. Look out for these ticks in China, Japan, Korea, New Zealand, and Hawaii alike.

Life cycle of a tick

tick stages
1) Egg

Female ticks often return to the ground or trees to lay their eggs safely. Some may still remain attached to the host to lay eggs. Female ticks can produce a range of eggs from 1,000 to 18,000 eggs in a batch. The female tick will die after producing eggs.

2) Larva

Larva that develop from the egg only feature six legs. After emerging from the egg, ticks will immediately search for a host to receive blood in order to survive and grow.

3) Nymph

After the molting process of a Larva, the additional set of legs appears, giving the tick nymph the distinguishable eight legs. These ticks will often look like the fully grown adult, but appear smaller in size. It is uncommon that nymphs will attach to a host to feed on blood during winter months.

4) Adult

The final stage in the life of the tick is the adult phase. After the nymph completes molting into an adult, the tick will be at its maximum size. Adult ticks require more food, so they will search for larger hosts, such as pets or humans, to satisfy their needs. A male tick will often die after mating and the female will die after laying eggs.

Diseases carried by ticks

The size of a tick is quite small but would be noticeable to the human eye or by touch. The ticks often latch on to the skin of a dog to suck its blood. Ticks can carry harmful diseases to humans and dogs, so immediate removal and prevention is necessary.

Two major illnesses are carried by ticks, but many more can be found in the blood-sucking pests. The two most crucial diseases are Lyme disease and Babesiosis which are carried by ticks around the world. These diseases are harmful to a dog’s immune system and energy levels.


This disease is rarer than Lyme disease but can be transmitted through tick bites. A dog that experiences babesiosis may show signs of depression, fever, swollen stomach, or pale gums. These symptoms are easily recognizable and may appear quickly after a tick has latched on to your dog. If your dog is showing signs of babesiosis, visit a veterinary professional immediately.

Lyme Disease

Lyme disease can be difficult to diagnose, as sometimes the symptoms may be easily noticeable, while other cases may only show effects in non-noticeable ways, such as internal damage or irritation. Prevention of Lyme disease starts with taking the right measure to protect your dog from ticks. Using these products repels ticks and kills them on contact if they try to latch on to your dog.

After a tick bites your dog, the Lyme disease can be introduced to their bloodstream, causing fever, lameness, and pain or swelling in joints. Lyme disease is especially harmful to dogs and humans, so preventative measures are necessary to ensure your dog’s health and safety.

There are a variety of symptoms to look for to determine if your dog may have Lyme disease:

  • Inflamed joints causing lameness
  • High fever
  • General discomfort or uneasiness
  • Loss of appetite
  • Sensitivity with physical contact
  • Signs of depression
  • Breathing difficulty
  • Stiff movements when walking

These are some noticeable symptoms to look for, but there are also internal complications that can come from Lyme disease. Your dog could experience inflamed kidneys or more serious cases of kidney failure.

Seresto is dedicated to ensuring that all dogs can have long-term protection from the dangers and complications of ticks. Avoid the harmful effects of a tick bite with the eight-month coverage offered through the gradual release of the pest repellent formula.

Tick removal

With the right methods, ticks can be removed easily from your dog’s skin or fur, but the best solution to forget about worrying about ticks is for prior preventative measures. The development of this leading tick and flea repellent dog collar has become the longest-lasting single-use preventative method available for pets.

Instead of worrying about constantly checking and removing ticks from your dog’s skin, the dog collar’s use of Flumethrin and Imidacloprid prevent ticks from latching on to your dog and kill them on contact.

If you notice a tick on your dog before applying the collar, please immediately remove it manually and closely observe your dog’s physical health. The Seresto dog collar works quickly to prevent future ticks and their harmful effects.

Side effects

Your dog may experience some side effects from using one of these Seresto products. These side effects are very rare but may include symptoms such as skin irritation, hair loss, vomiting, or convulsions.

The collars have been meticulously scientifically developed this leading formula in pest prevention to ensure that the included active ingredients are safe for the dog and human contact. If your dog has a history of medical issues related to irritated skin or a sensitive stomach, then take special consideration when choosing a solution.

If your dog is experiencing any of these symptoms, remove the collar to check to see if the problems subside. These are very rare symptoms that your pet may experience, but if you have any questions about your pet and the collar’s effectiveness, feel free to ask a veterinarian specialist. Use with caution on dogs with histories of skin sensitivity.


Seresto has made a product that can be used on dogs of all sizes and most ages. The collar should not be used on puppies at an age under seven weeks old.

Use the smaller dog collar on puppies at an older age and size up according to the size of your dog. Choosing the proper collar size not only contributes to comfort but also ensures that the active ingredients work as properly as possible.

If there are fleas or ticks present on your pet before application of the dog collar, please remove them manually to ensure your dog’s health. It will begin to work after putting it on for the first time, so prior removal of pests is necessary to ensure your pet is safe.

  • Wash your pet with a soothing pet shampoo
  • Use a fine comb to inspect your dog’s hair
  • Use a flashlight to help you find these tiny pests
  • Remove pests with a pair of tweezers
  • Inspect your pet’s health in the upcoming days
  • After ensuring your dog is safe from pests, apply the Seresto dog collar for eight months of future protection and repellent

As with dogs, some people may experience skin irritation when first introduced to this chemical. This irritation is due to the compound being first introduced to the skin via physical contact. These compounds will quickly become familiar with you and your dog’s skin. Be mindful when using this collar if your dog is prone to skin sensitivity.

When first using a Seresto product, be sure to wash your hands thoroughly to prevent the ingestion of the chemicals.

If you are noticing that your dog is itching or exposed to a tick, it is a sign that the eight-month effective period is up. Be sure to keep a good record of what date you put the collar on your dog to be ready with the next collar after the eight month.

Our review

One of the most common methods of tick and flea repellent is a topical ointment. This method has become obsolete and outdated with the introduction of the Seresto dog collar. The extended duration of Seresto’s chemical compound is unrivaled, offering amazing eight-month coverage for dogs of all sizes. After the introduction of this revolutionary product, monthly topical products did not stand a chance. The eight-month duration of the gradual release formula provides total coverage from pests and the diseases they may carry. 

We recommend this product for any dog that spends time outside. The budget-friendly price ensures that your dog is covered for more than half a year. Ditch the expensive and tedious monthly topical or chewable repellent plans and make things much easier for you and your dog with the Seresto collar.

We cover the review of the Seresto dog collar for dogs over 18 pounds (8.2kg).

Look and Feel

The tin that the collar comes in is designed to keep the chemical compounds included in the makeup of the collar fresh for use. (Note: if you are waiting to use the collar at a later date, consider putting the product in the freezer for additional longevity). The tin provides the essential storage instructions as well as how to properly dispose of the product.
seresto review front previous and current packaging
Previous and current packaging
seresto review open
The collar is wrapped in plastic
seresto review collar
Length of the large dog collar is 27.5 in (69.85 cm)
seresto review excess
Cut off the excess length if the collar is too long

Additionally, to check the authenticity of this product, you can consult the lot number provided on the back with Bayer’s website.

You will find the collar inside the packaging. Remember that upon opening the packaging, the product will be most effective if put on your dog immediately. Your dog’s skin and fur will then be exposed to the preventative formula over the next 24-hours.

The collar features a ratcheting mechanism to ensure the proper fit for your dog. There is also a safety latch that will break-away if the collar is caught on something.


  • Eight-Month Protection from Ticks and Fleas and the diseases they may carry.
  • No risk of infection or internal illness caused from topical or chewable methods.
  • No sticky residue that causes irritation to other pets or humans
  • Dogs will be able to be bathed or swim immediately after putting the collar on 
  • Fast-acting compounds cover your dog’s skin and hair over the next 24-hours after application
  • Collar option is ideal for pets that experience irritation from topical or chewable methods


  • Can’t be used on puppies younger than seven weeks old
  • Cannot be used on cats 
  • Will not kill ingested pests
  • Some dogs may experience skin irritation from the formula


Can I use a Seresto dog collar on a cat?

Seresto has developed a specific size and fitting collar for cats. This collar is slightly softer and delicate for feline use. It is also customized to meet the specific needs for sensitive cat skin and hair. If your cat is constantly outdoors, ensure that it is protected from pest infestation with the Seresto cat collar.

The cat collar is outfitted with an adjustable strap designed to fit cats of all sizes. The eight-month effective period will ensure that your cat can roam freely without worry of irritation or exposure to harmful diseases.

The cat collar comes with an optional reflector to ensure that your cat is visible and safe at night time.

These collars protect pet cats from ticks, fleas, and lice with the same effectiveness of the dog collars. The fitting for the cat collar is different from the dog collar, but please be sure to use the correct collar for the correct animal and size to ensure the effectiveness and comfort of your pet.

Can I use a large collar on a small dog?

There are a variety of sizing options available for their dog collars. There are two classifications of collars: large (dogs over 18lbs – 8.2kg) and small (dogs under 18lbs – 8.2kg). To ensure the maximum effectiveness of the flea and tick preventing compounds as well as comfort for your dog, we recommend that you choose the proper sized collar.

Make sure to get the proper weight of your dog before purchasing a Seresto dog collar to ensure you purchase the right size.

The rugged, yet the safe design of the dog collar ensures that the collar will stay on, but an emergency latch-braking system will ensure that your dog will never be caught up by its collar in case of emergency.

Can I bathe my dog with the collar on?

The dog collar is designed to be water-resistant, allowing your dog to be bathed with the collar on. The lingering effects of the pest preventing compounds will remain, keeping your dog protected at all times. The collars are designed to last for up to eight months. The compounds will stay on the hair and skin of your dog, but if you do manage to wash heavily, be sure to allow the chemical compounds from the collar some additional time to re-spread across your dog’s body.

What size collar does my dog need?

There are collar fittings that can be customized to dogs of a variety of shapes and sizes. The main distinguishing factor of choosing a collar is your dog’s weight. If your dog is under 18lbs (8.2kg), then choose the smaller collar option. If your dog weighs over 18lbs (8.2kg), then choose the larger option. Choosing the right fitting collar will not only provide your dog with comfort but also helps the active compounds to be as effective as possible.

Seresto’s dog collars are designed to fit dogs of all types and provide the essential safety features in the latch to ensure that your dog will never be caught by the collar with the intuitive emergency-release mechanism.

Where to Buy?

We compared multiple online stores and the following are the 3 best stores.
petcircle petbarn
Score ⭐⭐⭐⭐⭐
Price of Seresto From $40.95 From $49.59 From $66.99
Free worldwide shipping ✔️
Shipping time 3-7 business days 14-20 business days 10-15 business days
Auto-delivery option ✔️ ✔️ ✔️
Accepts return ✔️ ✔️ ✔️
24/7 support ✔️
Wide range of products ✔️ ✔️ ✔️
Loyalty program ✔️ ✔️
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User reviews

Find out more from these hands-on reviews. If you have any questions, concerns, or tips about the collar feel free to share here! If you cannot find answers or have questions specifically about your pet, also remember to consult with a veterinary professional.

Have you tried the Seresto dog collar on your dog? Let us know how the experience was! We can provide feedback and answers to any questions. Let’s hear some real-life examples of dog owners opting for the longest-lasting tick and flea prevention method on the market.

Just got my dog groomed, had on the collar since April and groomer sent me photo, was covered in fleas after shave, had to do a flea bath

1.0 rating
July 17, 2020

Definitely not worth the $55

Eyvonne Griffin