Quote Originally Posted by Crazy-Cat-Lover
I don't use K9 Advantix and NEVER will! It contains permethrin - which is deadly to cats. Using this stuff on your dog when there are cats around can cause your cat to seizure and die. I will stick to Advantage.
Same here, but I have used regular advantage as well as frontline & frontline plus. I've never had a flea problem with either of the 3 that I have used before. I am happy with them all.