I bought the Hartz advance care for my 9 month old cat, Fishbone. I applied it as directed. I layed down to take a nap and about an hour later when I got up my son said something was wrong with Fishbone. He was breathing hard and shaking. I was chatting with a friend and told her what was going on. I mentioned that I had used the Hartz product. She said very strongly “get him washed off immediately and to the vet. I Washed him with dish soap immediately and took him to the vet. The vet was dismayed and said that he wished they would stop selling that product at Walmart as it cause problems “more than often”. He gave my cat a shot and the cat recovered. But he said…”some don’t” He told me that washing the cat probably saved his life. I went to Walmart and told them my story and let them copy my bill from the Dr. and they “said they would follow up on it. If these big stores would stop carrying it….then Hartz would have to pull it. Thankfully our cat is ok but I warn everyone not to use the product!