What medicine for a dog vomiting yellow fluid?

A dog vomiting yellow fluid needs the cause determined before medication, or the condition may be delayed. First, if it is from indigestion, feed probiotics to promote motility and aid digestion.

Second, if the dog has gastroenteritis with frequent vomiting, the fluid usually smells strong; temporarily withhold food, then give pet anti-inflammatory and anti-emetic medicine, and also some probiotics to regulate. If no improvement, seek veterinary IV treatment.

Finally, infections like canine distemper or parvovirus can also cause yellow vomit; this needs early veterinary treatment to improve the chance of recovery.