We used Hartz Topical Flea medication on our two cats. Within an hour they were both foaming at the mouth. We called the emergency vet they advised us they had received numerous call about similar reactions. They advised us to immediately bathe the cats and call back back if they were still showing symptoms an hour after the bath. After they were bathed both cats had hair loss and burns in the areas where the topical medication was applied. Please do not use these products on your animals!