What to Give a Dog With an Upset Stomach & Vomiting:

Watching your dog retch and heave is one of the most stressful experiences a pet owner can face. Vomiting paired with an upset stomach—clinically referred to as acute gastroenteritis—is one of the most common reasons dogs visit veterinary clinics. According to the Merck Veterinary Manual, acute vomiting affects an estimated 10–15% of dogs annually, and most cases stem from dietary indiscretion (eating something they shouldn't), sudden diet changes, or mild infections. The good news? Many uncomplicated cases can be managed at home with natural, supportive care. But knowing the line between a mild tummy ache and a life-threatening emergency is critical.

This guide walks you through exactly what to give a dog with an upset stomach and vomiting using natural approaches, how to identify when the situation is serious, and what to expect if a vet visit becomes necessary. Always consult your veterinarian before starting any home treatment, especially if your dog is very young, elderly, or has pre-existing health conditions.

What Is Acute Gastroenteritis in Dogs?

Acute gastroenteritis is inflammation of the stomach lining and intestines that develops suddenly—usually within hours of exposure to a trigger. The stomach becomes irritated, triggering the vomiting reflex, while intestinal inflammation leads to diarrhea, cramping, and gas. The condition is incredibly common; veterinary insurance data consistently ranks gastrointestinal upset among the top three claim categories.

The underlying mechanism involves the release of inflammatory mediators (histamines, prostaglandins) in the GI tract lining. These mediators stimulate the vagus nerve and the chemoreceptor trigger zone in the brain, initiating the vomiting reflex. In simple terms: something irritates the gut, the gut sends a distress signal, and the body ejects the contents.

Symptoms Checklist: How to Assess Severity

Not all vomiting episodes carry the same level of concern. Use this checklist to gauge whether your dog's condition warrants monitoring at home or immediate veterinary attention.

Risk Factors: Which Dogs Are Most Vulnerable?

While any dog can develop an upset stomach, certain factors significantly increase susceptibility and the likelihood of a mild case becoming serious.

Diagnosis: What to Expect at the Vet

If home care isn't sufficient, your veterinarian will follow a systematic diagnostic process. Understanding what tests to expect—and what they cost—helps you prepare financially and emotionally.

For most straightforward cases of acute gastroenteritis, Steps 1–3 are sufficient, bringing the typical diagnostic cost to $225–$445. The AVMA recommends establishing a relationship with your vet before emergencies arise so they already know your dog's baseline health.

Natural Remedies: What to Give a Dog With an Upset Stomach and Vomiting

For mild, uncomplicated cases—where your dog is alert, hydrated, and has vomited only once or twice—these natural approaches can support GI recovery. These methods focus on gut rest, gentle rehydration, and gradual reintroduction of easily digestible food.

The 12–24 Hour Fasting Protocol

The most effective first step is often the simplest: stop feeding. A short fasting period allows the inflamed stomach lining to rest and repair. During this time:

• Withhold all food for 12–24 hours (12 hours for small breeds and puppies over 4 months; 24 hours for healthy adult dogs)
• Do NOT fast puppies under 4 months, diabetic dogs, or toy breeds prone to hypoglycemia without veterinary guidance—they need caloric intake to maintain blood sugar
• Offer ice chips every 30–60 minutes instead of a full water bowl to prevent gulping and re-triggering vomiting
• After 4–6 hours without vomiting, offer small sips of water (1–2 tablespoons every 30 minutes for small dogs, 2–4 tablespoons for large dogs)

Bland Diet Recipes

After the fasting period, introduce a bland, low-fat diet in small portions. Feed approximately 1/4 of the normal meal size every 3–4 hours for the first day.

Natural Supplements & Soothing Additions

These additions can complement the bland diet once your dog is keeping food down:

• Plain canned pumpkin: 1 teaspoon per 10 lb body weight per meal. The soluble fiber absorbs excess water in the GI tract and firms stool. Ensure it's 100% pumpkin, not pumpkin pie filling (which contains xylitol, a toxin for dogs).
• Bone broth (homemade, no onion or garlic): Simmer beef or chicken bones in water for 12–24 hours, strain, cool, and skim fat. Offer 1–2 tablespoons warmed slightly. Provides hydration, electrolytes, and glycine, which supports gut lining repair. Never add onion, garlic, or excessive salt.
• Slippery elm bark: A demulcent herb that coats the GI lining. Dosage: approximately 1/2 teaspoon of powdered bark per 10 lb body weight, mixed with warm water to form a gel, given 30 minutes before meals. Available at most health food stores. Consult your vet before use, especially if your dog takes medications, as it can slow drug absorption.
• Probiotics: Look for canine-specific formulations containing Enterococcus faecium or Lactobacillus acidophilus. Products like Purina FortiFlora or Proviable-DC provide 1 billion+ CFU per dose. Start once vomiting has stopped to help restore gut flora balance. Human probiotics are not toxic but contain strains less adapted to canine GI environments.
• Ginger: Small amounts of fresh ginger (a pinch of grated root for small dogs, up to 1/4 teaspoon for large dogs) mixed into food can reduce nausea. Ginger contains gingerols that act on serotonin receptors in the gut. Use for no more than 2–3 days.

Transitioning Back to Regular Food

Once your dog has tolerated the bland diet for 2–3 days with formed stools and no vomiting, begin transitioning back to regular food over 4–5 days:

• Day 1: 75% bland diet, 25% regular food
• Day 2: 50% bland diet, 50% regular food
• Day 3: 25% bland diet, 75% regular food
• Day 4–5: 100% regular food

If vomiting or diarrhea returns at any stage, go back to the previous ratio and hold there for another 24 hours before attempting to advance again.

Treatment Comparison: Natural vs. Veterinary Medical Approaches

Veterinary anti-emetic medications commonly prescribed include maropitant (Cerenia), which blocks substance P at the NK-1 receptor, and ondansetron (Zofran), which blocks serotonin 5-HT3 receptors. These are prescription medications your vet will determine the correct dosage for based on your dog's weight and condition.

Prognosis: What to Expect Based on Underlying Cause

Life expectancy after a single episode of simple gastroenteritis is unaffected—dogs return to their normal lifespan. For chronic or systemic causes, prognosis depends entirely on the underlying diagnosis. Your veterinarian is the best source for individualized prognosis after diagnostic testing.

Prevention: Reducing Future Episodes

The American Kennel Club notes that many GI upsets are preventable with consistent management practices:

• Gradual diet transitions: When switching foods, transition over 7–10 days, increasing the new food by 10–15% daily while decreasing the old food proportionally.
• Secure trash and compost: Use dog-proof trash cans with locking lids. Compost bins should be inaccessible—moldy food contains tremorgenic mycotoxins that cause severe vomiting and seizures.
• Supervise outdoor time: Prevent scavenging of dead animals, standing water, and unknown substances. Leash walking in high-risk areas (parks with goose droppings, areas with rodent bait) reduces exposure.
• Maintain vaccination schedules: Core vaccines (DHPP, which covers distemper, adenovirus, parainfluenza, and parvovirus) are essential. Puppies need the full series at 6–8, 10–12, and 14–16 weeks, with a booster at 1 year, then every 3 years per AAHA guidelines.
• Regular deworming: Follow your vet's parasite prevention schedule. Monthly heartworm preventives (many of which also cover intestinal parasites) are standard for most dogs.
• Slow-feed bowls: Dogs that eat too quickly often vomit. Slow-feed bowls or puzzle feeders reduce gulping and air ingestion.
• Avoid table scraps: High-fat human foods (bacon grease, butter, fried foods) are common pancreatitis triggers. Consistency in diet is the simplest prevention strategy.
• Stress management: For anxiety-prone dogs, maintain routines, provide enrichment, and consider calming supplements (L-theanine, chamomile) during known stressors like travel or boarding.

Cost Breakdown: Budgeting for Upset Stomach Treatment

Gastrointestinal issues are among the most common veterinary visits, and costs vary widely depending on severity:

Pet insurance with accident-and-illness coverage typically reimburses 70–90% of these costs after deductible. Average monthly premiums for this coverage range from $30–$70 depending on breed, age, and location. Given that a single emergency surgery can exceed $5,000, insurance is a financially sound consideration for most dog owners.

Frequently Asked Questions

Can I give my dog Pepto-Bismol for an upset stomach?

Only under direct veterinary guidance. The standard veterinary-recommended dose of Pepto-Bismol (bismuth subsalicylate) for dogs is 0.5–1 mL per pound of body weight every 6–8 hours, but it should never be given without your vet's approval. It contains salicylates, which can cause stomach ulcers, interact with other medications, and is dangerous for dogs with kidney issues or aspirin sensitivity. It is also contraindicated in puppies and pregnant dogs.

How long can a dog go without eating when they have an upset stomach?

Healthy adult dogs can safely fast for 24 hours. Small breeds (under 15 lb / 7 kg) and puppies between 4–6 months should not fast longer than 12 hours due to hypoglycemia risk. Puppies under 4 months, diabetic dogs, and dogs with metabolic conditions should not be fasted without veterinary supervision. If your dog refuses food for more than 48 hours, a vet visit is necessary regardless of other symptoms.

Is it normal for my dog to eat grass when their stomach is upset?

Grass eating is common—studies suggest 68% of dogs do it regularly. The theory that dogs eat grass specifically to induce vomiting is largely a myth; only about 22% of dogs vomit after eating grass. It may serve as a source of roughage or simply be an instinctive behavior. However, if your dog is frantically eating grass and then vomiting repeatedly, it suggests active nausea and warrants attention. Also ensure the grass hasn't been treated with pesticides or herbicides.

What breeds are most prone to chronic upset stomachs?

Breeds with higher rates of chronic GI sensitivity include German Shepherds (predisposed to inflammatory bowel disease and exocrine pancreatic insufficiency), Yorkshire Terriers (hemorrhagic gastroenteritis), Great Danes and other giant breeds (GDV risk), and brachycephalic breeds (French Bulldogs, Bulldogs) due to their compressed anatomy. Dogs with food allergies—commonly to chicken, beef, or dairy proteins—can be of any breed but are overrepresented in West Highland White Terriers, Cocker Spaniels, and German Shepherds.

When should I stop home treatment and go to the vet?

Seek veterinary care if: vomiting continues beyond 24 hours despite fasting; your dog shows signs of dehydration (tacky gums, skin that doesn't snap back when pinched at the scruff); blood appears in vomit or stool; your dog becomes increasingly lethargic; the abdomen appears swollen or is painful to touch; your dog is a puppy under 6 months with any vomiting; or you suspect your dog ingested a toxic substance, foreign object, or human medication.