About 3 weeks ago my wife, wanting to save some money decided to buy and use the Hartz flea and tick shampoo and flea and tick application. That night he had a seizure. He had one the next night as well. We took him to the vet and spent alot of money on tests. Nothing showed up. He has since had a couple more so we decided to put him on medication the vet gave us. This has been a horrible experience. My vet said she had heard about the Hartz issue with their flea and tick produts and seizures. I wish there was a class action suit I could join.