The Seresto® Dog Collar: How Does it Work?

By: Orvis Staff

If you spend much time outdoors and have a dog or two, perhaps you will agree that ticks are the bane of our existence. They are a constant, ubiquitous threat to our health and sense of well-being. And, to make things worse, their their numbers are on the increase according to scientists.

Unfortunately, there’s little we humans can do to prevent these dreaded ticks from making their way onto our bodies—we just have to constantly check for them upon returning from our outdoor adventures. And, we keep our fingers crossed we didn’t miss those microscopic nymphs that are all but invisible to the naked eye.

The good news is, the Seresto® collar is an effective tick repellent for dogs. This innovative technology not only eliminates ticks, it gets rid of fleas and flea eggs on dogs as well. Fleas on dogs have been a problem for as long as anyone can remember, particularly in warm climates, and there hasn’t been a truly effective flea repellent on the market until now.

Fellow dog owners rave about the Seresto collar, claiming it’s more effective than the other flea and tick preventative products they’ve used, especially since it’s practically foolproof. They explain that it’s convenient and not prone to ‘user error’ since it doesn’t involve any messy, monthly topical application they must remember. And, it can last many months before it needs replacing. Many veterinarians recommend it as well.

For more detailed information, following are some answers to common questions about the Seresto collar:

How Does Seresto Actually Work?

The Seresto collar comes in two sizes, to fit around your large or small dog’s neck, similar to an ordinary collar. It contains two active, odorless chemicals—imidacloprid (for fleas and their eggs) and flumethrin (for ticks)—which are released in low concentrations and distributed over the dog’s body on a sustained basis for up to eight months. These chemicals have been proven to kill fleas and ticks on contact within a matter of hours.

Does the Seresto Collar Still Work If My Dog Gets Wet?

The Seresto collar is water resistant, retaining its effectiveness even after your dog goes swimming, is bathed, or gets caught out in the rain. Repeated water exposure will shorten the effective life of the collar, depending how frequently it happens. Consult the manufacturer’s product information for details.

How Effective Is Seresto Compared to Other Flea and Tick Preventatives on the Market?

Unlike other flea and tick collars, Seresto is long lasting and continues to work even after it has gotten wet. And, it eliminates all fleas and ticks from the dog’s entire body, not just those near the collar. It is also different because it eliminates adult fleas as well as their larvae, interrupting the fleas’ life cycle. It works more quickly than competing products, reducing the chance of tick-borne disease transmission. Finally, because there’s no need to remember to reapply Seresto, it’s more reliable than topical solutions such as Frontline®.

Does the Seresto Collar Have Side Effects?

According to the manufacturer, Seresto has been tested extensively for safety. Reported side effects include allergic reaction, lethargy, localized skin irritation, and hair loss on the dog’s neck. We recommend consulting your veterinarian with any questions or concerns before using Seresto.

Seresto— Additional Notes and Features

The Seresto collar works only when your dog is wearing it. The collar is not effective against heartworm infection; your dog still requires an ongoing heartworm preventative, as prescribed by your veterinarian.

As a safety consideration, the collar is designed to break off if it gets caught on something while your dog is wearing it. And, it comes with reflectors you can attach to make your dog more visible at night. The Seresto collar is not meant to replace your dog’s regular collar with ID. Alternatively, you could also equip your dog with the personalized side-release collar to which the Seresto collar can be attached.

Unfortunately, there is no perfect solution when it comes to finding an effective flea and tick repellent for your dog, but Seresto is a proven deterrent. Its effectiveness relates in large part to its ingenious design which makes it especially easy to use. Now if only there were as reliable a way to keep ticks off of humans! Or, better yet, a way to keep ticks well away from all of us.

16 thoughts on “The Seresto® Dog Collar: How Does it Work?”

  1. Love these collars. I have used the others, the pills and the liquid, and wound up picking dead, but still bloated, ticks off of my dogs, which left a hole in my dogs skin. The collars on the other hand, prevent the ticks from ever getting on them to begin with. I don’t understand why anyone would not use them!!

  2. Yep!! We love the collar as well. Unfortunately my wonderful husband cut the collar too short! He weighs 125. However, we have had luck with them. Our 16 year old daschund wears 1 a year!!

    1. Ugh, Put collar on my lab and 4 live fleas. I am shocked. Any thoughts? It’s been 4 days and all the nessary cleaning and even steaming everything in sight.

      1. It may not be effective if it is not on tightly enough. Do not leave more than a snug 2 fingers under the collar. I must be against the skin.

  3. I have been using this particular collar for 4 years. Unfortunately the new one I purchased about a week ago is not working. My dog has fleas( insert catchy tune). I have never had this problem in the 4 years of using this product. I know it’s the name brand as I purchased it at the same store I always do. Now I have to deflea my home and I’m not happy at all. I also plan to contact the manufacturer to let them know this collar failed me 🙁 Before this I would recommend this brand to everyone I knew with a cat or dog.

  4. I had the same result. Used it successfully on my former dog, but this time the fleas seems to be attracted instead of repelled. Just had a terrible infestation with my sweet little rescued Poodle/Maltese.
    What do I do now?

    1. I have been a huge fan of the collars the last two years. Recently I bought 4 collars for my German Shepherd’s. None of the collars are working.
      I am pulling off live fully engorged ticks everyday, the ticks are feasting, causing the usual redness, oozing & long lasting bite mark. The ticks are not dying or being repelled like previously. Something has changed. Right now I would not recommend using them.

    1. It may not be effective if it is not on tightly enough. Do not leave more than a snug 2 fingers under the collar. I must be against the skin. Call Bayer Healthcare, LLC, 1-800-255-6826.. They will answer and discuss all questions and give your pet a case number to follow your pet’s situation.

  5. Love these collars. Had an infestation and started using Seresto collar along with washing all bedding and daily vacuuming of the floors and upholstery. It took several days for all fleas to be effected on the dogs.

    For those who have had flea infestations, it takes a full 90 days of treatment inside the house to fully get rid of the fleas and break the lifecycle. All the fleas are not on the dog!!! If your dog has fleas your entire house has fleas.

    I have never had a tick problem using this collar. We live in Florida, so fleas & ticks are a huge problem.

  6. I love these Collars. So far they have worked on my two Shih Zui wonderfully!! Im so excited because nothing I tried seemed to work. They were chewing on themselves till they were bleeding. I felt so bad for them. My babies are highly allergic to fleas and I’m so glad the clerk at Petsmart told me about them. I had gone in the store getting what I always use and they were out if it so the clerk told me about how all her customers that use these collars swear by them. I will recommend them to everyone. I just wish they weren’t so high. I feel $50 is a fair price but my babies are worth the price I paid.

  7. These collars work very well on fleas but it takes a few weeks to break the flea cycle. Best product yet for flea control.

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