Updated September 25, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: The most common food causes of stomach upset in dogs are fatty table scraps, sudden diet changes, garbage and spoiled food, bones, and dairy. Some foods are also toxic, including grapes and raisins, onions and garlic, chocolate, xylitol, and macadamia nuts. Dogs with sensitive stomachs do best on a consistent, complete diet with slow transitions and limited extras.
Common culprits
- Fatty foods: bacon, fat trimmings, gravy, fried food. These can also cause pancreatitis.
- Sudden diet changes
- Garbage, compost, and spoiled food: may contain toxins from mold
- Bones: can cause vomiting, constipation, blockages, or injury
- Milk and dairy: many adult dogs are lactose intolerant
- Rich treats and rawhide in some dogs
- Spicy or heavily seasoned foods
Toxic foods
- Grapes, raisins, currants
- Onions, garlic, chives
- Chocolate, coffee
- Xylitol
- Macadamia nuts
- Alcohol and raw yeast dough
Tips for sensitive stomachs
- Change foods gradually over 7–10 days
- Keep treats under 10% of calories
- Secure garbage cans
- Ask your vet about a gastrointestinal diet for recurring problems
If your dog eats something toxic, call your vet or a pet poison hotline right away.
Sources
- ASPCA Animal Poison Control Center: People foods to avoid feeding your pets
- Merck Veterinary Manual: Pancreatitis in dogs
- Merck Veterinary Manual: Mycotoxicoses
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.