Vomiting is a common problem in pets, and many things cause dogs to vomit. If your dog's vomit is a yellowish colour, it may be vomiting bile. While vomiting is distressing to both the dog and its owner, vomit does not necessarily signal a dangerous illness. Chronic vomiting is a fairly common ailment for certain dogs.
The simplest explanation for your dog vomiting a yellowish bile is that it has not been recently fed. Some dogs have more active stomach secretions that cause upset stomachs in the absence of food. If your dog tends to vomit bile in the middle of the night, try giving it a snack before bedtime. Sometimes this simple change in feeding pattern is enough to stop the vomiting problem.
Inflammatory Bowel Disease
Vomiting bile possibly indicates that your pet has inflammatory bowel disease. This is a fairly common chronic ailment among dogs. Symptoms include vomiting bile, having diarrhoea and weight loss, although all of these symptoms need not be present. Inflammatory bowel disease is treated by changing the dog's diet and giving it antibiotics. Consult your veterinarian if you think your dog's vomiting may be caused by inflammatory bowel disease.
Canine ulcers result from use of anti-inflammatory medications, pain relief medications or certain types of skin cancers. Dogs with ulcers vomit blood and bile, lose their appetites and become weak. Your veterinarian can conduct blood or urine tests to determine if your dog has a canine ulcer. Treatment generally involves feeding your dog a bland diet, tapering use of problematic medications and introducing an acid-blocking medication.