Seresto Flea Collar for Dogs Review

A Flea Collar That Fights Both Fleas and Ticks?


There are several different methods for getting fleas and ticks to leave your dog alone, but which one is the best?

We’re going to take a look at the ingredients, warnings, and share information from other users, so you will know exactly how well the product worked for other and what you can expect when you make your purchase.

Company Claims

Seresto Flea Collar for Dogs will do two different things. It will repel fleas and ticks and will kill any currently living on your dog. It does take up to 48 hours for the toxin to spread over your pet, so any ticks should be removed by hand.

The flea collar will last for up to 8 months and will repel both fleas and ticks for the entire time. It is water resistant and will continue to release medication even if it gets wet or dirty. It is odor-free and will not cause harm to your pet, even if they manage to chew on the collar.

Active Ingredients

Seresto Flea Collar for Dogs has two active ingredients:

How this ingredient works

Imidacloprid acts as a neurotoxin in insects, causing them to lose control of their central nervous system. This leads to paralysis and eventual death. It is also slightly toxic to mammals and should only be used on the outside of your dog. It is one of the most widely used insecticides in the world but it is considered moderately toxic when ingested orally.

Flumethrin is similar to Imidacloprid except that it was developed to work on tick instead of fleas. It is nontoxic to mammals and did not show any adverse effects in any of its laboratory studies. It is used in this situation because it also neutralizes the adverse effects from ingesting the previous medication.

Usage Information

The Seresto Flea Collar for Dogs is easy to use. All you do is remove the collar from the bag and place it around the dog’s neck. Adjust the tightness of the collar until two fingers can be inserted under the band.

Snip off any excess collar that may stick out beyond the end of the clip. This prevents other animals from grabbing onto the collar and removing it from your dog.

The collar comes with a breakaway clip that will release if it is every caught on another obstacle. This prevents your dog from chocking on the collar and allows them to escape without harm.

What Are Users Saying

The reviews for this product are pretty terrible. Many people reported finding ticks even after the initial 48 hour waiting period. There were even reports of animals getting flea infestations after only one or two months of wearing the collar.

All of the reviews were negative regarding the effectiveness with ticks. Some animals even developed chemical burns on their necks after wearing the collar for a few days.

Side Effects and Precautions

Some of the side effects of the Seresto Flea Collar for Dogs include itchy skin, redness, swelling and intense scratching around the collar. Some dogs even had problems with red eyes after the first few days, which disappeared when the collar was removed.


There is no way we could recommend the Seresto Flea Collar for Dogs because, according to the people who have used the collar, it doesn’t work. Normally, a few negative reviews are expected for any product, but having only negative reviews shows that a product is probably not the best investment.

If you need to keep fleas and ticks away from your dogs, there are safer and more effective products available.

If you’ve used this product, please tell us about your experience in the comments section below.

25 Responses to “Seresto Flea Collar for Dogs Review”
  1. Scott says:

    I have been using the Seresto collar on my 12 year old and 3 1/2 year old dogs (Labradors)since June 6th 2013. In that time each dog has developed diarrhea and my older dog has been near death in the emergency vet clinic all weekend at great expense mind you with severe vomiting and diarrhea.

    I’m not saying it is the Seresto collar but neither dog is known to eat foreign objects or dead animals as they are in a fenced enclosure. For precaution I am taking them off it. The similarity and timing of their symptoms is no coincidence I believe.

    • Melissa says:

      No Coincidence Scott,

      The same is happening to my two year old Golden Retriever. I put the collar on her two weeks ago and she started having the same symptoms. I took it off, bathe her and gave her bland diet and she returned to normal. I called bayer when this happened and they said that this couldn’t happen. There could have been other variables- berries growing in back yard that could have caused it. I waited until a few days ago and put it back on. the same symptoms started to happen again. Called Bayer back and got a refund.

    • Bonnie says:

      No Coincidence! My Weimaraner started loosing spots of hair and had severe diarrhea. Toy poodle became very lethargic. Thank God we noticed before it was too late.

  2. Cindy W says:

    I started using this flea collar about a month ago and my 5lb Chihuahua is now a very sick dog. 3 weeks ago he had 4 very strange seizures. Strange as he’d come out of them immediately, no sluggishness, nothing. This morning he lost his bladder, his legs don’t want to hold him up and he’s not eating. He’s taking water from me through a syringe, quite a lot thank goodness. One of those chemicals used is the same used in nicotine and can cause seizures in dogs. I had him a the Vet 3 weeks ago and his physical was normal, his blood work better than normal. It stumped the doctor. Needless to say he no longer has the collar on, I’ve washed his neck with Dawn, (he got pretty annoyed with me….that’s a good thing!), and he’s resting. I’m retired, fixed income etc, so no Vet again until Monday when I get paid. The last visit was about $500 and out of money. And scared.

    • Anonymous says:

      Look for a not for profit Spayed and Neuter clinic. They will treat your animals for so much less than a Vets Office. The clinic has volunteer vets that volunteer their time and you don’t have to pay the high prices for the same services.

    • Kris says:

      You should contact the manufacturer, look for phone number on back of box or on this site. If your vet agrees that these symptoms were caused by this product, you should get reimbursed for your vet bills. It was not with this company but with another that my dog had gotten very sick from their flea medication. It took a few months, but i was reimbursed for my $400 vet bill and the supply of medication i had bought.

    • Loretta C says:

      Oh my gosh, Cindy. I just saw your comments and now cannot help but wonder if the Seresto collar is what caused my little silky terrier to start having seizures. The last one she had she could not even walk or stand up at all for over 12 hours. The vet assured me the collar had nothing to do with it, but I am removing it now. Thank you for sharing your experience and I pray your little fella is better now.

  3. Mark says:

    My 4 to 5 yr. old Pekingese had a petit mal seizure after wearing the Seresto 8 month flea/tick collar for a little over a week. Also had episodes of vomiting. My approximately 10 yr. old Pekingese also had episodes of vomiting. Have removed the flea collars! Do NOT recommend.

  4. Betty says:

    Put seresto collar on my 4 year old Australian cattle dog mix. With in a couple of weeks she was vehemently shaking her head. Took collar off gave bath shaking went away in a few days. Waited 1 month put collar back on same problem. She was shaking her head uncontrollably. Will not use again.

  5. Sharon S says:

    I too started using the Seresto collar on my 6 yr old sheltie, vet recommended! :(. … I removed the collar today, after only a month of use. He had become increasingly lethargic with bouts of diarrhea with weakness: I had to carry him home from a short walk today. We went through so much this past month trying to figure out what was wrong: two expensive Vet visits, food change, antiobiotics, unnecessary worming for a rare intestinal bug and now the vet wants to do a colonostomy? I actually thought my sheltie was dying …we never looked at the collar as the cause.
    So, my grandson is hugging my sheltie, in an attempt to comfort him, and the side of his face swells! Time for the collar to go!!! I just wrote a letter to Bayer: asking for a refund, explaination and apology.

  6. Barbara Smith says:

    My friend put this collar on her rat terrier and that very night he lost control of his bladder. The next day his breathing was labored and he couldn’t stop panting. A burn developed on his neck. He was taken to the vet and the collar was removed. Almost immediately his breathing improved and he stopped panting. A few chemical burns appeared on his body which are being treated with medication. The collar was returned and a refund given. A warning label should come with this collar and vets should be responsible too.

  7. Me says:

    We have these on our dogs now, my poodle was infested and the collar worked and still works great. No problems what so ever even on my cat and Italian Greyhound

  8. sinne says:

    I love this product. I work at a vets office and use it on all my dogs and 1 cat. When I started using it I had a flea infestation. 1 year later I have had no problem with fleas or ticks. I have also recommended it to several clients who have dogs with FAD and it totally helped because it definitely seemed to repel the fleas BEFORE biting. Its great.

  9. Staci says:

    I have tried almost everything to get rid of fleas on my 3 dogs from Dawn to the flea pills. My poor senior pug was miserable and losing her fur and my two American Bullies would hide on bath day. A month ago I bought this flea collar for all three of them and I have had nothing but fantastic results.My pugs fur is growing back and the fleas are gone. I will definitely keep an eye on my dogs after reading this but for now I am going to keep using it

  10. Nancy says:

    We are on our second collar for our six dogs, 5 cairn terriers one chi mix. Have not had any problems with fleas tick or sickness. When we bathe we take collars of until dogs are complete dry. We live in South west Georgia capital of heat, fleas and ticks. With any new product there negative results. So far we are a positive results. I feel for all those of you that have had to endure all of these side effects, I know how much our pets mean to all of us. We LOVE ours so much.

  11. Sue L. says:

    We put the Seresto flea & tick collar on our 20lb, 10-12 yr old dachshund at 7pm & by 3am she had a hacking cough. I removed the collar immediately. As the day went on she still coughed, but it had subsided a bit. Also bathed her a especially washed the area on her neck where the collar had been. Took her to the vet and spent good money as always and did get our money back for the collar. They will tell you when you call the people who make this collar that they had never heard of that side effect or any off them. My husband said “really, they’re a whole bunch of reviews on the internet” and the person he talked to said “I wonder if those are for real reviews”. No idiot, a bunch of people just went on line to bash this flea and tick collar. Geez, what moron’s!!!!

  12. Alana M says:

    Got collar from Vet. Within 24 hours of applying, Max (80 lb Pitbull) wouldn’t eat, was lethargic, and his skin looked like an allergic reaction. He was constantly scratching he’s neck. Developed bleeding wound on neck from scratching so much. Removed collar on day 4 which is today. Benadryl seemed to help him rest earlier. He was given a long Dawn scrub shower to help remove chemicals. At first, I was thinking scabies, but now I think it’s the collar. Wish I could post pics on here. He’s appetite has already improved today. Hoping he’s skin gets better soon.

    • Alana M says:

      Called Bayer and explained situation. Bayer said to take collar and reference # to vet and vet will start process with them for a refund. Taking Max to vet in the morning for treatment to make sure he isn’t getting septic. Max has lost more hair on back of neck and wound is now weeping fluid. Rash is getting better and he’s eating good. Still giving Benadryl twice a day along with some old doxycycline.

  13. Sydlit says:

    I left my Chi/Mix and my cat for 5 days while I was in hospital, with a friend stopping by to take care of my fur kids a couple times a day. . When I got home both pets and my house was saturated with fleas, to the point that they were on my bed and on me. After trying everything, including tried and true remedies, nature made sprays and topical treatments were ineffective. I bought both cat and dog Seresto collars…in one week not much change. In checking, the collar was too loose, I tightened it and not only did all the fleas on the animals die, but also in the house! They had no reaction or discomfort with this collar. However, I adopted a senior dog this May and ordered him a Seresto collar. I applied it loose and over a period of two weeks I slowly tightened it. Now when it was as tight as recommended, he scratched and scratched at the collar, skin under it was OK – I finally removed it and he hasn’t scratched since. The other two are still wearing their collars.

  14. Sydlit says:

    This is an addendum to my previous statement…I removed all the Seresto collars, including the ones applied 5 months ago. My Chi/Mix has had stomach upset and cat seems ok, but after reading these reviews, I’m not taking any changes with my fur kids.

  15. Donna C says:

    Our dog is now wearing her 2nd collar. She stays in the house at night when we’re home but during the day she roams through the weeds and woods. Until she started wearing this collar it was nothing to get 5-10 ticks a day off her. She hasn’t had any bad effects and she doesn’t have fleas or ticks. We highly recommend the Seresto collar.

  16. Bobbie Dickie says:

    I have used a Seresto Collar on my two dogs (one border collie and one collie cross) for the past 6 months as we live in a tick prone area. Neither dog has had any side effects and also neither dog has had a tick since wearing the collar. This has been an excellent purchase because my dogs were frequently getting ticks attached. I used to use Front Line but the Seresto collar is more effective – no irritation and no messy application.

  17. John Bomba says:

    Since putting collar on my toy poodle she has been scratching and scratching. Her ears are also red. I spoke with my vet, she was not sure. I have taken the collar off and her scratching has stopped. I will be sending a note to Bayer tonite.

  18. Sandy says:

    Wow! I lost my 11 year old Beagle a few weeks ago. He was sick for about a month, started with loss of appetite, then when he did eat vomiting and diarrhea. Took him to our vet, then VSEC center. Said it was gastroenteritis, treated him with fluids and antibiotics but no improvement. Spent $$$$$ to no avail, finally had to put him to sleep. He had one of these collars on three months. I now believe this may have been the cause. Now my three year old Aussie started with diarrhea. After reading the above, just cut the collar off and going to give him a bath!

  19. Melinda says:

    Seresto Collar – Very SERIOUS SFX from 6 month old large breed puppy! Within 2 days of use, puppy became very aggressive towards me, (lunging and biting) with seizure like activity for about a week. Called vet and vet said to put puppy down! I REFUSED!Sought elsewhere and found NOT behavioral issues, but Neurological issues from collar! Immediately took collar off and puppy back to normal, loving self. Contacted FDA, they referred me to EPA as collar considered an insecticide! Got refund back from vet BUT never used vet, again, either! Time for a petition against Bayer – Seresto Collar!!!

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