My cat was in perfect health other than a possible case of fleas (I'm not even sure of that) so I took him to the vet for the first time in YEARS for a flea bath.  Instead of a flea bath he put this poison on my cat.  The very next day my cat began refusing to eat or drink anything, and would just lay on the floor and not move.  I called the vet who said the flea medication couldn't POSSIBLY harm him because "it's FDA-approved" (what a load of B.S.!!!).  Anyway, this continued for nearly a week until my cat became nothing but skin & bones and was suffering terribly.  We finally accepted the fact that it wasn't going to get better & had to take it in to be put down.  There is absolutely no doubt in my mind that Bayer killed my cat with this poison!!!  Now I remember why I stay the heII away from doctors (including vets).