Short answer: there’s no single “best” food that works for every dog — first try a short bland-diet/rest period, then one of the easily digestible or limited‑ingredient formulas below; if symptoms persist or are severe, see your veterinarian (some dogs need prescription or hydrolyzed diets and/or testing). (petmd.com)

What to try (strategy)

• Short-term first aid: withhold food for ~8–12 hours if your dog has mild vomiting, then offer small amounts of a bland diet (plain boiled chicken or turkey breast + white rice) and plenty of water. Use canned pumpkin (plain, not pie filling) for mild diarrhea; probiotics can help. (petmd.com)
• Diet types that commonly help sensitive stomachs:
  • Limited‑ingredient / single‑protein diets (fewer ingredients to identify/avoid triggers). (bluebuffalo.com)
  • Novel‑protein diets (e.g., duck, venison, rabbit) if the dog might be reacting to common proteins. (akc.org)
  • Low‑fat diets for dogs that have trouble digesting fat or have pancreatitis risk. (royalcanin.com)
  • Hydrolyzed or prescription gastrointestinal diets for food‑responsive allergies or chronic GI disease (these are veterinary‑only and often very effective). (royalcanin.com)
• Transition slowly: mix increasing amounts of new food over 7–10 days (moving faster can itself cause loose stools). (petmd.com)

Over‑the‑counter (OTC) foods that owners/vets commonly recommend (examples, not an exhaustive list)

• Hill’s Science Diet Sensitive Stomach & Skin (OTC): formulated for easy digestion and includes prebiotic fiber. (hillspet.com)
• Purina Pro Plan Sensitive Skin & Stomach (OTC): prebiotics and digestible protein/carbs aimed at GI support. (petsmart.com)
• Blue Buffalo BLUE Basics (limited‑ingredient line): single animal protein options and simplified formulas for sensitive dogs. (bluebuffalo.com)
• Natural Balance L.I.D. (limited ingredient diets): several single‑protein/carbohydrate recipes for dogs with intolerances. (petsense.com)

Prescription / veterinary diets (use only under veterinary guidance)

• Hill’s Prescription Diet i/d (digestive care) — highly digestible, used for acute or chronic GI issues. (petsmart.com)
• Royal Canin Gastrointestinal (including hydrolyzed / low‑fat veterinary formulas) — veterinary exclusive options for complex or persistent problems. (royalcanin.com)

When to see the vet (don’t wait)

• Go to your vet promptly if your dog has repeated vomiting (>2–3 times in 24 hrs), diarrhea lasting >24 hours, blood in vomit or stool, severe lethargy, signs of dehydration, or if your dog is a puppy, senior, or has other medical conditions. Those situations can be urgent. (vcahospitals.com)

Quick practical checklist

• Remove treats/table scraps during any diet trial. (akc.org)
• Pick one new food at a time and feed it exclusively for at least 2–8 weeks (many elimination trials run ~8 weeks) so you can judge effect. (petmd.com)
• Keep a log of stool quality, vomiting episodes, appetite, energy, and any skin changes — this helps your vet. (akc.org)

If you want a narrower list (by life stage, size, budget, or specific symptoms like vomiting vs. loose stool), tell me your dog’s age, weight, and main symptoms and I’ll give 3 tailored options (one budget OTC, one premium OTC, and one vet/prescription option).