I have a 9 month old Jack Russell who keeps vomiting. I have taken him to the vet numerous times and they find nothing wrong. I have tried chaging his diet but after a few days he is vomiting again. It seems to come in spells. He'll be ok a few days, then he'll vomit, not eat that day, and generally by the next day hes ok again. I am very concerned that there maybe be something the vet is missing. Also the hair on the knuckles of his paws is gone, and the skin red, and irritated looking. This also has been going on for sometime. All tests for mites, etc come back negative.

Optional Information:
Age: <1; Male; Breed: Jack Russell Terrier

Already Tried:
Everything/p>