He's been doing it for years, I took him to a vet who basically said there was no physical reason for it and to try changing his food. So I went to a specialty pet food store and they recommended a grain free diet. It worked-- for a little bit, but he is still occasionally vomitting.
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wwolfs brings up a common reason they throw up. Sometimes they don't throw up the hairball right away...they can throw up for a couple of days and then finally get the hairball out. The butter is a great idea (I use that too).