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Seresto is a topically-applied flea and tick collar for cats, dogs and ferrets that uses key active ingredients to provide 8 continuous months of full spectrum control. It controls fleas, ticks, lice, mites and other external parasites. It is important to keep in mind that Seresto may cause side effects in cats or dogs, even if they appear healthy.

The most common side effect seen with Seresto is skin irritation at the site of application. Redness, itching, swelling or hair loss may occur and can be treated with topical ointments prescribed by your veterinarian. Rarely, an allergic reaction may occur but signs usually resolve within a few days without specific treatment. Other less common side effects include decreased appetite or activity level, vomiting or diarrhea which can indicate gastrointestinal discomfort or intolerance to the product. In these cases it is important to consult your veterinarian for advice on how best to proceed. Care should also be taken when using Seresto nearwater as it has been shown to have adverse effects on aquatic lifeforms such as some species of fish and amphibians if ingested directly from the coat of an animal that lives in contact with water frequently.

More serious symptoms such as difficulty breathing, pale gums, seizures or sudden collapse are considered serious medical emergencies and require immediate veterinary attention

Skin irritation

One of the possible side effects of Seresto is skin irritation in certain people. While this type of reaction isn’t common, it can www.seresto-collar.com still occur in some cases. The most frequent signs of skin irritation involve redness, itching, swelling, or a rash where the Seresto collar was applied.

If you notice any signs of skin irritation after applying the Seresto collar, consult a qualified medical professional as soon as possible. A healthcare provider can help you decide whether or not to discontinue using the Seresto collar and/or provide advice on how to reduce your chances of experiencing this side effect in the future.

It’s important to note that allergies or sensitivities to certain materials are common causes of skin irritation from collars and other products like them. To reduce your risk for experiencing this type of reaction, always read product labels carefully before using and pay close attention to any warnings about potential allergens or irritants in the formula.


One potential side effect of using Seresto is excessive drooling in some cats and dogs. The drooling is caused by the bitterness of the active ingredient, which some pets find difficult to tolerate.

If your pet is drooling after using Seresto, don’t be alarmed. While most pets won’t experience this side effect, it can still happen in rare cases. While annoying to pet parents, the drooling is typically not a health concern. In most cases, it goes away as soon as your pet gets used to the taste of the collar or after discontinuing use of the collar.

However, if you’re concerned about your pet’s drooling while they’re wearing their Seresto collar, you should consult your veterinarian for advice on how to proceed. They may recommend discontinuing use if necessary or advise that you wait and see if it resolves itself over time.

Rough coat

One of the possible side effects of Seresto is rough coat. This occurs when your pet has an allergic reaction to the medication resulting in dry flaky patches on their skin. Unlike other pet medications, which can sometimes cause an increase in shedding or oily coats, a rough coat develops from contact with the active ingredients in Seresto.

Your pet’s coat may start to show signs of roughening soon after Seresto is applied and will often take a few weeks to return to normal once the medication has been removed. If you notice any rough patches appearing on your pet’s coat, it’s important to talk with your veterinarian right away. They’ll be able to help identify if Seresto is causing the problem, as well as recommend treatments such as medicated shampoos or dietary supplements that might help return your pet’s skin and coat back to its normal condition.


The overall benefits of Seresto may outweigh the risks associated with its use, but talk to your veterinarian prior to getting a Seresto collar to protect your pet against parasites.