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Dog vomiting is a somewhat common occurrence, but it becomes a true health concern when a dog is throwing up bile. If your dog throws up yellow foam, or a yellow-green foam, it’s probably bile, and you should take your pup to the vet right away to determine the cause. Bile is produced in the liver, stored in the gall bladder and released into the small intestine to help break food down. This helps the body digest and utilize the food properly. If your dog is throwing up bile, these are the five most common reasons.