Lindane is toxic in young and exotic animals, as well as sick or debilitated animals. Permethrin is found in many spot-on insecticides, a popular flea control product for pets. Manufacturers label ...

Dr. Kathryn recommends "looking for keywords like 'pet-friendly' or 'safe for pets'" and steering clear of ingredients such as permethrin, pyrethroids, and organophosphates, which can be toxic to ...