Lately I have noticed cat vomit in my basement. I have two cats, so I wasn't sure which one was vomiting. Now I have found it is my male cat, as he just tried to eat, and vomited twice. I have not changed any food. Both cats have been eating Nutro Max Cat for a long time now. Any ideas on what this could be? It is not a hairball, it is vomit with food.