I have a 14 month old lab. We fed him Taste of the Wild large breed puppy food for the first year with great results. At one year I mixed 50/50 of the same brand puppy/adult food to try to gradually break him in. He would vomit his dinner two hours later, still in kibble form, about once a week. We switched him over to the Adult food and he would vomit the same way, about every other day. I looked at the ingredients of the Adult formula and noticed that although it was supposedly all natural, that it had a pretty high wheat content. After talking to my breeder he told me to try a food with no corn, wheat or soy--so I did. I started off the week with a couple trial size of Diamond Naturals, he didn't vomit once so I thought I had the problem licked. Well, now it's the end of the week and he is pretty much vomiting one meal a day up. Since this problem started when I switched food, I'm assuming it's a food problem and not a health problem for now. I'm about to take him to the vet if it continues to happen over the next couple days, but I figured I would take advantage of sharing a forum with some grads of the best vet med school in the country for their input. If it matters, I feed him 2 cups twice a day and his spirit hasn't changed at all. He isn't losing any weight and he doesn't show any of the signs of sickness--dry nose, swollen gums, and eyes. Thanks for any input.