We had to have our cat put to sleep due to the Hartz 3in 1 flea medicine. Our vet was very sympathetic but stated that Hartz products are not at all good for our feline friends despite the claims. He asked us to research phenothrin on the Internet as well as study all the negative claims against Hartz. Not only are we mourning the loss of our beloved cat we are also learning about the tremendous devastion their products cause. I am glad I found this website. In memory of my now deceased cat I will advocate against Hartz at any given chance. Here’s to my baby “PuffBall”!