Taz has been throwing up alot latly. When he does, it looks like dod food that has been soaked in water. It doesn't look like he is digesting any at all. He has always had a sensitive stomach but the vomitting got worse after he was neutered, which was about one montha ago. He also has luxating patella and he's in alot of pain most of the time. We are in the process of scheduling his surgury for that, but right now I am more worried about the vomitting. Does anyone have any idea what I should do, or what the problem might be?