Our 9 year old male mixed breed has always had a vomiting problem. On our vet's advise, we have changed diet, eating time, etc., but to no avail. (We even got a second opionion - no results) When he vomits, it is a greenish/yellow bile color. It is definitely not from eating grass, as he is generally indoors and we are with him when he is outside. Please advise.
I recommend that you see a specialist such as an internist. A specialty hospital may be able to help but be ready to spend some $$. Vetcare