I was concerned about ticks and fleas this year, so picked up this product at WalMart yesterday. Have never had a problem with stuff like this, so put it on my adult cat. Within 15 minutes she was racing around, then started panting and acting scared, like she was seeing stuff. I did a quick google search and saw your entries, and we immediately washed it off. While washinig it off she was thrashing around and acting like she would bite us. Out of her mind, completely. She is normally a very sweet, playful cat so this was frightening. Within 15 minutes of washing it off she started to calm down, and in 30 minutes her breathing and heart rate was closer to normal. I think this stuff could have killed her, and plan to complain to Hartz directly.