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My cat is weak and sick after a Seresto collar. Is it safe?

Updated On September 23rd, 2025

Pet's info: Cat | Maine Coon | Male | neutered | 9 years and 10 months old | 11 lbs

I had a 7 month Seresto on my cat, after that 7 months recently I put another on him. Is that safe? He has been acting real weak, slow and sickly. Could it be the collar making him sick?

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on June 28th, 2018

Side effects of the collar may include the symptoms you described. Remove the collar for 24-48 hours to and see if Brewer improves. If not, have him examined by your veterinarian to diagnose illness or injury.

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