One of our latest additions have been vomiting daily. Finally took him to the vet yesterday. They did an X-ray to make sure he didn't have a blockage of some sort. Come to find out, he was basically constipated. The vet said since he wasn't going, whenever he ate there was no room for the food so it would cause him to throw it up instead of coming out the other end. They put him on some hairball medication to help lubricate the bowels. If he doesn't improve in a few days, we have to take him back. So far he hasn't vomited.