For about two weeks my 3yr old Maine Coon has been dry heaving 1-2 times per day. Nothing has been regurgitated. His appetite is strong, energy level is normal, and his stool looks good. Being a long hair, I suspected hairballs, so I started brushing him rigorously every day and gave hairball gel. No luck.
The only bit of context I can provide is a recent change in his diet. 5-6 weeks ago he started vomiting after every meal; he was on Wellness Core dry. After doing some research I moved him over to a raw food diet. Right away he stopped vomiting and his stool firmed up and now has no odor.
When he was vomitting I brought him to the vet. They tested for pancreatitis, did an X-ray, and a full blood test. I was told his organs are in good shape and they found no "red flags". Pancreatitis was negative, and X-ray was fine, though they believe he should lose a pound.
Does anybody have ideas about what might make him dry heave?