I bought a german shepard on april 1st 09. I put a hartz collar on her she was 7 weeks old. On June 7th she was running across the lawn and she started having a seizure. I took her to the vet the next morning. I was told then about the harm these collars do to animals. She has had 8 seizures that I know of since that day. The vet said hopefully she will grow out of them when the poisions finally leave her system. I think Hartz should have to pay for my vet bills. I bought this dog to eventually breed and sell the pups. Now having had seizures I cant ever breed her. She will have to be fixed. I’m extremely mad about this.