Empty stomach, motion sickness, Foreign object ingestion, kennel cough, bloat or pancreatitis are some of the possible causes for white or foamy vomit in dogs.
Common causes of yellow dog vomit include acute conditions such as foreign object ingestion, an empty stomach, and heatstroke, it is also a common cause of several chronic illnesses.
The red color in dogs is always a medical emergency that needs medical surveillance and care. It indicates possible internal bleeding in the dog’s body.
Gray dog vomit color may show that your dog’s stomach is empty or upset. Liquid at the beginning of vomiting episodes, but it can turn foamy if the dog keeps vomiting.