Last night, 5-1-05, my girlfriend Kelly, put the hartz stuff on our 3y/o Maine Coon, and 6 m/o Gray Tabby. This was given to us by her VET!!!!!She called me this morning at 5am and told me that both cats were having leg spasms. I told her to immediately bathe both of them, and make sure to do their backs, then put them in the bathroom and turn on th heat to make sure they stayed warm. When I got home, the spasms had stopped. I called my vet (185 miles away) and they immediately went off the deep end. They told me to keep a good check on them to make sure that they acted fine, and didn’t have any mre spasms. I think they are going to be fine as the tabby is playing.