I know of a black leopard that was kept at one of the airboat ride attractions in Florida. The attendant thought the cat was not drinking enough water, so instead of asking for help concerning this problem she started putting salt on his raw chicken, that he was fed everyday. It made the cat stop eating and then it died.
Another pet owner of a baby cougar came asking for advice why his pet was not doing very well. We found out they were feed the cougar canned cat food. It was explained that wild cats cannot survive on canned cat food, but must have raw meat such as chicken or beef with the bones. The owner would not listen and so his pet baby cougar died soon after,from lack of proper food.