Seresto Flea Collar Reviews and How It Compares with Advantix For Dogs?

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November 6, 2022 / Dog Grooming / By: Krystine Therriault

Seresto Pet Flea Collar Reviews

The ugly truth is that fleas and ticks are blood-sucking parasites which can destroy your pup's health and peace of mind. Get rid of these pesky pests by using a flea dog collar that actually works and you will have a much happier furry friend.

Seresto’s dog collars promises to keep these dreaded parasites at bay. If you want a longer term solution skip the cheap grocery store flea collars. Here’s why.

Seresto flea collars are effective for repelling the most common found flea species: Deer ticks, American dog ticks, Brown dog ticks, Lone Star ticks, chewing lice, and for treating Sarcoptic mange. They also protect dogs against fleas and control flea larvae in a treated dog’s surroundings to prevent further infestations.

How long does it take for Seresto to start working?

Seresto starts to treat existing tick infestations within 48 hours after application and re-infesting ticks are repelled or killed in as little as six hours. Existing fleas are killed within 24 hours and re-infesting fleas are killed in as little as two hours.

Once the collar is on, flea and tick infestations are effectively prevented for up to 8 months.

Effectively repelling ticks can prevent several diseases that can affect dogs, like Lyme disease or Rocky Mountain spotted dog fever.

The first thing you'll note happen when your dog starts using these collars as part of their flea prevention and treatment is that the scratching stops.

Soon you'll start to find dead fleas around the house because the treatment is working. Seresto is a good flea collar for owners who take their dogs hiking and in the woods where fleas and ticks are always around. I only wish they had a human version because even though my dog is tick free after the hike I’m not!

Seresto flea dog collars are water resistant and effective for dogs who are bathed monthly and swim occasionally.

You don’t have to worry about taking the collar off before bathing your dog, which makes it less likely that you’ll forget to put it back on and risk another infestation. 

For dogs who swim or are bathed more often than once per month, the effectiveness of the collar can be reduced to approximately five months. You can remove the collar and put it back on after to avoid reducing its effectiveness.

Seresto Side Effects

Like most products for pets, Seresto isn’t perfect and you should always keep your eyes open in case your furry friend experiences any side effects of this treatment.

Some dogs may react to Seresto collars at first, experiencing some of the following symptoms:

  • Scratching
  • Redness
  • Hair loss

These mild reactions usually go away within a week or two and don’t require removal of the collar.

If symptoms persist longer, you may need to temporarily take off the collar and bathe your dog. In rare cases, more severe symptoms like:

  • dermatitis,
  • inflammation,
  • eczema, and
  • lesions may occur.

In this case you should remove the collar and see a vet if symptoms persist.

Overall, these cases are rare and most dogs do not experience any problems with Seresto.

What are Seresto’s Ingredients?

Seresto dog collars use two common active ingredients: Flumethrin 4.5% and Imidacloprid 10%.

Imidacloprid is the ingredient that kills adult fleas and flea larvae, while Flumethrin repels and kills ticks and their larvae.

Bayer’s Polymer Matrix material ensures that these ingredients are released slowly and continuously in low concentrations that are safe for dogs and spread from the point of contact throughout the dog’s whole skin surface.

When putting on the collar, you should leave two fingers worth of space (with a little bit more space for a growing puppy) see the picture below.

Seresto dog collars use a safety close mechanism and is durable enough that a dog cannot open the collar and release the active ingredients.

But be careful as the collar can come off, so you need to keep an eye out to make sure that your buddy’s collar is always on.

Owners showing to leave space for two fingers when fitting a flea dog collar

Allow two fingers worth of space

The collar has a built-in safety mechanism so the collar will break if pulled on so dogs don’t get trapped or choked. Owners shouldn’t attach a leash to this collar, because that could also cause it to break.

Pros of Using Seresto

Seresto dog collars score well over other flea and tick treatments because they are odorless, non-greasy, and easy to use. You don’t have to wait for this treatment to dry, worry that it will stain their furniture, or worry that it will come off their dog.

All owners need to do is measure out the dog collar and put it on using the safety closing mechanism.


You can cut off excess length on the collar if there is any.

They are waterproof and stay on for the whole 8 months under most circumstances whether your dog is dog-kayaking with you or fond of swimming in every puddle, lake or river! You just need to keep an eye out if your four legged friend is especially active and readjust their collar if it happens to get too loose.

Seresto dog collars work on all coats, so even dogs with thick fur will be effectively covered by this treatment. You should place the collar as close to the skin as possible, leaving them enough space to be comfortable.

Unlike other flea and tick treatments, you don’t have to remember to give your pup their monthly treatments. This is a big pro because expensive treatments can be rendered ineffective if an owner forgets to give their dog the next dose on time.

You just have to mark the date on the calendar and remember to change your dogs’ Seresto collar every 8 months! Tick (pardon the pun....)!

Is Seresto Safe to Use?

Seresto is safe for pets, humans and the environment.

Best of all, these dog collars are safe to handle for both dogs and humans.

There are still some potential side effects, but most dogs and cats (yup they are for cats too) can wear these collars without any problems.

Seresto dog collars are built to slowly release active ingredients in safe quantities. You can touch these collars with your bare hands and don’t have to worry about any negative reactions.

These doggy collars are comfortable to wear and even come with light reflectors for added visibility at night. Since they are waterproof, they are still effective for dogs who are bathed once a month and swim occasionally.

Cons of Using Seresto

For dogs who are bathed or swim more than once a month, the effectiveness may be reduced to only five months. Some owners have also noticed this after an especially rainy season.

There are also some instances where side effects are reported with these dog collars, although they are rare. Most side effects go away naturally, but some are more severe and may need vet intervention.

Some prefer topical flea and tick treatments because you don’t have to worry about the possibility of a collar coming off.

Some have noticed that while the reflectors look well and are useful, they are clip on pieces that can fall off and pose a choking hazard to children and animals.

Comparing Seresto VS. Advantix

Seresto dog collars are more affordable and last longer compared to Advantix, another frequently used flea and tick treatment.

Advantix versus Seresto for flea control

Advantix is a monthly topical treatment that lasts for about four weeks. A pack of four Advantix treatments costs approximately $50. Also by Bayer, Advantix treatments are considered safe for dogs but some suffer from mild or rare side effects.

One big difference is that this topical treatment (Advantix) has more active ingredients. There is imidacloprid 8.8%, Permethrin 44%, and Pyriproxyfen 0.44%.

Because of this owners need to be careful how they're handling it, not to get it in their dogs’ eyes and mouth and wash hands if it comes in contact with your skin.

In addition to more common symptoms like redness and skin irritation, owners have also reported gastrointestinal symptoms like vomiting and diarrhea after treating their dogs with Advantix.

Overall, Seresto is easier to use and lasts longer than most flea and tick treatments on the market. It is also one of the more effective treatments currently on offer!

Using the Seresto flea treatment is particularly great if you lead a busy life and have trouble remembering to keep up with monthly treatments AND want a collar that can be safely left on during baths and swimming.

Seresto collars save you money, and they are designed to be safer for dogs and their owners.

Seresto's Best Flea Collar for Small Dogs and Puppies

Seresto for Small Dogs and Puppies

Seresto’s small dog collars are suitable for puppies aged 7 weeks and older that weigh up to 18 pounds.

They are particularly great for small breeds like Boston Terriers, Chihuahuas, Miniature Dachshunds, Maltese, Maltipoos, Pomeranians, Pugs, Yorkies, and more.

Seresto's Best Flea Collar for Large and Medium Dog Breeds

Seresto Collar for Large Dogs

Seresto’s large dog collars are suitable for puppies aged 7 weeks and older that weigh over 18 pounds. The large seresto flea collar is 27 inches long in total.

They are particularly great for larger dog breeds like Golden Retrievers, German Shepherds, Rottweilers, Bullmastiffs, Irish Setters, Tibetan Mastiffs, Collies, Alaskan Malamutes, and more.

Final Verdict

The advantage of using a preventative flea collar, is that your pet can get long-term relief from fleas and ticks than if you were relying on grocery-store treatments, shampoos, sprays or lotions.

In addition, Seresto dog collars are effective for treating a number of pests including ticks, fleas, and Sarcoptic mange on dogs. These collars are great for houses that are currently experiencing flea or tick infestations and are also effective for preventing infestations.

Unlike other flea and tick collars, Seresto effectively repeals and kills fleas and ticks, protecting dogs from disease and discomfort. They uses two trusted active ingredients that are released slowly over the course of eight months to keep dogs safe from diseases caused by these annoying and pesky pests.

To get rid of a flea and tick infestation, use Seresto in conjuction with vacuuming (sealing the vacuum bags before throwing them out) and washing fabrics and soft toys in warm soapy water to help rid your home of fleas and ticks and making not only Fido happy but also the entire family!

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Krystine Therriault

Krystine Therriault is an accomplished writer. With a passion for all creatures cute and furry, Krystine's life has been touched by many beloved dogs over the years. She is also a loving mother of two boys and an avid yogi.

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  1. Why doesn’t Seresto make an extra large collar? I have a St Bernard and the large collar does not fit her. Which is disappointing because I really love Seresto. I have friends that have St Bernards and other large dog breeds who also used to buy Seresto but don’t now because they aren’t large enough.

    1. Thank you for your comment Sandra regarding the Seresto flea and tick control collars for extra large breeds. Unfortunately Bayer Animal Health don’t produce Seresto in an extra-large size at this time despite there being a large enough demand given the collar’s popularity. But hopefully this will change in the near future.

  2. Was very happy with the first two collars. But now this third collar has stopped working after 3 months. My dog and I are very displeased with this product. I want to sue Bayer for false advertising. Does anyone else have problems with this product? Paying $80 dollars for something that no longer works is bullshit!!!

  3. I just ordered and put it on my dog for the first time.. I am very disappointed because they only come in 2 sizes.. The small collar only good up to 18 pounds . Any size dog after that weight you have to buy the large size and I did bought the large size because my dog weigh about 24 pounds. The collar was too big. The only comment I have is I wish they come with medium size for medium size dog. Make sense?

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