Occasional vomiting in dogs may be due to eating too quickly or being too full; this is usually not serious and is considered physiologic. If the dog is in good spirits and shows no other signs of discomfort after vomiting, no special treatment may be needed, only temporary dietary adjustments and observation.  However, if a dog vomits frequently, contains blood, bile or foreign objects in its vomit, or is accompanied by other symptoms (such as diarrhea, listlessness, or refusal to eat), this may indicate a health problem and a veterinarian should be contacted promptly for an examination. In some cases, vomiting can be an early sign of a more serious illness, so even if a dog appears normal after vomiting, remain vigilant and seek professional help if necessary.