My cat, Shadow, died last night after a visit to the cat hospital. We brought him in because of a lump on his chin that was getting large and it was sore to the touch. Our other cat, Sebastian, has been acting aggressive lately and we wondered if Sebastian had bit Shadow. The nurse at the hospital shaved the lump and took Shadow in the back room to have him looked at. Our other cat, Sebastian, has been acting aggressive lately and we wondered if Sebastian had bit Shadow. When he came back Shadow had a exposed area that the vet told us "the skin just peeled off as I touched it and now the muscle in exposed." This was only in a tiny area. They also removed fluid from the lump and gave him a antibiotic injection. We were told that the lump was filled with a puss like fluid and that it was harmless and localized. We were told to isolate Shadow for the night and make sure he is eating and drinking (we have another cat). Shadow began to eat and drink and acted normal towards us. We wanted to keep him in our larger bathroom last night and see if his exposed sore was better this morning. When I woke up this morning, Shadow had passed away. I am heading to the our vet (not the hospital!) right now. I don't know what to think. The hostpital told us he was fine and that the bump was nothing. Something just doesn't seem right and I really have to wonder if the hostpital screwed up. I wonder now if our 2nd cat knew something was wrong and that is why he has been acting odd. I just hope our vet can tell us he died of natural causes and it wasn't malpractice. I don't know what to think right now.