I have 2 cats, Patches, 5 yrs and Tubbs, 8 yrs. Tubbs, our orange tabby has been throwing up on and off for the last few months and I don't know why or what to do about it. Tubbs, is about 8 years old and both cats eat the same high quality (can't remember name at the moment) dry food they have always eaten. They get a lot of fresh water, changed twice daily. I thought he might be eating some of the house plants we have but I see absolutely no evidence of it. Tubbs will throw up everything in his stomach and then do the dry heave thing for a while. Both cats have had recent vet check ups and are perfectly healthy. So, how do I figure out what's going on?