Our family pet for 9 years was found dead this morning, two days after using the one spot Hartz behind the neck flea killer. he was a large black cat weighing about 15 pounds. Up until that time he was healthy, I believe the flea medicine killed him, and am afraid to tell my children that it was because of that. He is now buried in our backyard, and we will miss him terribly, I only hope that the same stuff for dogs that I used on our scotty terrior will not do the same, she is getting a bath and I will never use that spot tick killer again. What do these people that make and sell this killer stuff think!! That we dont care about our pets. We are very upset!