Reading Time: 4 minutes Are you having some misgivings about that Seresto flea collar your cat is wearing? Despite thousands of incident reports to the Environmental protection Agency, both the EPA and toxicologists at the Pet Poison Helpline say not to worry. A recent review of the scientific literature on Seresto collars and their own animal poison control case data show the collars are safe, the toxicologists say. Maybe they are. But there are other safer natural ways to get rid of fleas, and your cats won’t have to breathe insecticide from the collars around their necks.