Why Is My Dog Vomiting and What Should I Do?

By Dr. Sarah Chen, Veterinarian, DVM · Reviewed by Marcus Webb · Updated Nov 1, 2026

Is your dog vomiting? Learn common causes, warning signs, safe next steps, and when to contact your veterinarian.

Vomiting in dogs can come from something as simple as an overdue meal or eating too quickly, but it can also signal illness, parasites, medication reactions, or a swallowed object. A single episode is not always an emergency; repeated vomiting, weakness, abdominal pain, or blood are reasons to seek veterinary care promptly.

Common reasons your dog may vomit

Dietary causes include eating too fast, a sudden food change, rich treats, table scraps, or food intolerance. Grass, spoiled food, and garbage are also common triggers. Other possibilities include stomach inflammation, gastritis, parasites, infections, pancreatitis, kidney or liver problems, heat stress, motion sickness, and reactions to medicines or chemicals. Bitches may vomit during early pregnancy, but other causes should still be considered.

What to do next

Check for emergencies. Look for repeated retching without producing food, a swollen or painful abdomen, pale gums, difficulty breathing, collapse, tremors, or suspected poisoning. Contact a veterinarian or emergency clinic right away.
Remove food briefly. For an adult dog that seems otherwise well, withhold food for a few hours, following your veterinarian’s guidance. Keep water available and offer small, frequent amounts. Do not restrict water unless advised.
Watch and document. Note the number of episodes, appetite, water intake, stool, and any possible exposure to toxins, foreign objects, new foods, or medication. This helps your veterinarian narrow down the cause.
Resume food gradually. If vomiting stops, offer a bland, easily digested meal, then reintroduce the regular diet gradually over several days. Puppies, small dogs, and dogs with medical conditions need individualized advice.

Feeding a familiar food in smaller portions, using a slow-feeder bowl, and limiting rich treats can help prevent diet-related vomiting. Transition foods gradually and keep garbage securely closed.

When to see a veterinarian

See a veterinarian promptly if vomiting repeats, lasts more than a day, or occurs with blood, diarrhea, fever, dehydration, lethargy, abdominal swelling, breathing difficulty, or inability to keep water down. Seek emergency care for collapse, severe pain, repeated unproductive retching, suspected toxin exposure, or a possible swallowed object. Do not give human medicines or induce vomiting unless a veterinary professional specifically instructs you to.

How the cause is diagnosed

Your veterinarian may examine your dog and review vaccination, diet, and exposure history. Depending on the signs, testing may include bloodwork, fecal analysis, imaging, or an ultrasound. Treatment is based on the cause and may involve fluids, nutritional support, parasite control, or prescribed medication. Never use leftover antibiotics or anti-nausea products without veterinary guidance.