Can Seresto collars cause stomach issues

Seresto collars are a safe and effective way to protect your pet from fleas and ticks. They contain a pesticide called imidacloprid, which kills multiple species of parasites, including fleas and ticks. However, as with any medication or treatment, there is always the possibility that your pet may experience some side effects.

The most common side effect associated with Seresto collars is skin irritation, such as redness, itching, or rashes. In rare cases, they may also cause more serious symptoms like vomiting or diarrhea. Though these symptoms are rarely caused by Seresto collars, it’s important to be aware of them and watch for signs of illness in your pet if you use one. Therefore it is possible for Seresto Collars to cause stomach issues. In addition to watching for signs of illness in your pet when using a Seresto collar, you should contact your veterinarian if you notice any adverse reactions on the skin near where the collar was applied.


Seresto collars are one of the most popular flea and tick preventatives available, but they can cause stomach issues in dogs. The active ingredient imidacloprid can irritate a dog’s digestive system and cause vomiting or diarrhea. Other side effects may include lethargy, weight loss, or mouth inflammation. To prevent these issues, make sure to follow the recommended dose and use the collar at least once every 8 months. Additionally, monitor your pet carefully while wearing the Seresto collar and look out for any signs of an allergic reaction or digestive problems. Seresto collars are a safe and effective way to prevent flea and tick infestations in your dog, however it’s important to be aware of potential side effects like stomach issues.

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