2 years ago I put Hartz flea topical on my beautiful main coon cat. He was the best cat ever. I loved him very much. Anyhow I woke up in the middle of the night he was vomiting and diarrhea very bad. I had to rush him to the animal hospital and they put him on IV fluids and did blood work. I told them what I used for flea protection and they told me that was the worst stuff (the hartz). I had to leave my baby at the vets and 1 hour later they called to tell me he died.