Will a dog vomiting yellow fluid get better on its own?

If a dog vomits yellow fluid because of long-term hunger and excess stomach acid, it may recover on its own. But it is best to give some probiotics to help the gut recover, then feed the dog on a regular schedule and avoid letting it alternate between starving and overfeeding.

If the yellow vomit is caused by distemper, parvovirus, or similar, take the dog to a veterinary hospital promptly — these diseases progress quickly and can seriously harm the dog, even causing death, so the owner should apply the right treatment based on the dog’s actual condition.