About 4 years ago I adopted a Chow-Sheltie mix 10 wk. puppy from a local animal shelter I named Barkley. While Barkley has been a wonderful dog, easy to train, the most extroverted of creatures ever encountered, he does not like to eat, at all, EVER. About once a week he will vomit all his food up. 2 years ago he had to spend 2 days at the vet because he had not eaten or drank ANYTHING!! Several expensive tests later, nothing was discovered. Any thoughts or ideas. I feed him a combination of kibble, rice, and some kind of meat or fish.