my two dogs and two cats reacted very negatively to their hartz flea treatments yesterday. they were rubbing themselves on everything they could find to get it off. today the dogs seem to be alright but my biggest cat is twitching and convulsing, his eyes keep closing and his entire body is shaking!! he has tried aggressively to lick off the hartz and we have fed him some hydrogen peroxide to make him throw up and have rinsed off the nasty chemicals but he still is shaking uncontrollably and has facial twitches. 🙁 i hope he gets better. i’ve had him for 9 years.