My husband and I noticed fleas on our pets (2 dogs, one cat) and immediately went out to get some flea treatment. Hartz was all they had at the time so that’s what we brought home. The first application went smoothly for all three animals. The second application I applied this morning; both dogs took it fine, but now the cat is shaking, twitching, running away from us and hiding (which is unlike her normal social/snuggly self). My husband is giving her a warm bath now as I write this and next time I’ll make sure to check around at other stores before ever settling for this poison again.