Why Does Your Dog Keep Throwing Up?
Vomiting, stomach pain, and lost appetite. Here's what gastritis looks like in dogs and when to call the vet.
If your dog has thrown up a few times this morning and is now moping around the house, there’s a good chance you’re dealing with gastritis, which is simply inflammation of the stomach lining. It’s one of the most common reasons dogs end up at the vet, and most cases resolve quickly with the right care. That said, some situations do need medical attention sooner rather than later. Here’s how to figure out which one you’re in, what to watch for, and what to do in those first critical hours.
TL;DR
- Gastritis in dogs means the stomach lining is inflamed, and it usually shows up as vomiting, reduced appetite, and abdominal discomfort.
- The most common cause is dietary indiscretion (a.k.a. garbage gut), but triggers also include infections, medications, foreign bodies, and underlying conditions like pancreatitis or IBD.
- Mild cases can be managed at home by withholding food briefly and then transitioning to a bland diet, but bloody vomit, dehydration, or vomiting that lasts more than 24 hours means it’s time to call the vet.
- Acute gastritis usually clears up within a day or two; chronic gastritis in dogs can last weeks or months and needs a vet’s help to diagnose and treat.
- Lemonade Pet insurance can help cover the diagnostics and treatment for gastritis when it’s not a pre-existing condition.
What is gastritis in dogs?
Gastritis means the lining of the stomach has become irritated or inflamed. Think of it like a sunburn on the inside of the stomach wall. When that lining is inflamed, it can’t do its job properly, and your dog’s body responds by trying to clear everything out fast.
There are two main types. Acute gastritis comes on suddenly, usually after your dog ate something they shouldn’t have, and typically resolves within 24 to 48 hours. Chronic gastritis in dogs is a longer-term pattern of recurring stomach inflammation, lasting weeks or months, and it usually signals something deeper going on.
Signs of gastritis in dogs
Most of the signs of gastritis are pretty hard to miss. Here’s what to watch for:
- Vomiting: Sometimes repeatedly, sometimes with bile (the yellow or foamy fluid that comes up when the stomach is empty).
- Loss of appetite: Your dog may turn away from food entirely or seem uninterested in meals they’d normally inhale.
- Abdominal pain: This can look like hunching, guarding the belly, or being reluctant to move or be touched around the midsection.
- Lethargy: Less energy than usual, wanting to just lie still.
- Nausea cues: Excessive grass eating or repeated lip licking are both signs a dog feels sick to their stomach.
- Diarrhea: Sometimes alongside vomiting, sometimes on its own.
- Bloody vomit or vomit that looks like coffee grounds: Dark, grainy flecks in vomit are a sign of digested blood in the stomach. This one warrants a call to your vet right away.
That last point is worth its own mention. Coffee grounds vomit indicates bleeding in the stomach lining, which puts it in a different category from standard gastritis. Hemorrhagic gastritis involves active bleeding and needs prompt veterinary treatment, not home care.
What causes gastritis in dogs?
The most frequent culprit is dietary indiscretion, sometimes called garbage gut. That’s just a polite way of saying your dog ate something they absolutely shouldn’t have. Spoiled food, table scraps, garbage, a sock, part of a toy: dogs are not discerning diners, and their stomachs pay the price.
Beyond that, common causes include bacterial or viral infections, intestinal parasites, and foreign body ingestion. Certain medications, particularly NSAIDs like aspirin or ibuprofen, are hard on the stomach lining and should never be given without vet guidance. Food allergies or intolerances can also be a trigger, especially in dogs with recurring stomach issues.
In some cases, gastritis is a sign of something bigger. Pancreatitis, IBD, and in older dogs, kidney or liver disease, can all show up as stomach upset before anything else becomes obvious. Stress and anxiety are worth considering too, since they can disrupt digestion in ways that look a lot like gastritis.
Home care or vet visit? Here’s how to decide.
Most vomiting dogs are going to be okay, but some need a vet sooner rather than later. When in doubt, call your vet or an emergency clinic. They can help you figure out what’s going on and whether your dog needs to be seen, even just over the phone. That said, here’s a quick gut-check to help guide you.
| Monitor at home if… | Call your vet now if… |
|---|---|
| Your dog vomited once or twice and seems otherwise okay | Vomit contains blood or looks like coffee grounds |
| They’re alert, drinking water, and not in obvious pain | Gums are dry, tacky, or pale (signs of dehydration) |
| No other symptoms alongside the vomiting | Vomiting hasn’t stopped after 24 hours |
| They’re still interested in their surroundings | Your dog seems weak, lethargic, or has collapsed |
| Appetite is reduced but not completely gone | The abdomen looks bloated or your dog guards it when touched |
| Symptoms started recently and haven’t gotten worse | Your dog is a puppy, a senior, or has a known health condition |
| You think they swallowed something they shouldn’t have |
If you’re in the left column, here’s what to do:
- Withhold food for 6 to 12 hours to let the stomach settle. Always keep fresh water available.
- Offer a bland diet in small amounts after the fast: plain boiled chicken (no skin, no seasoning) with plain white rice, or a vet-recommended bland food.
- Feed small portions every few hours rather than a full meal.
- Gradually reintroduce regular food if your dog keeps the bland diet down for 24 to 48 hours.
If you’re in the right column, skip the home care. Head to your vet or an emergency clinic ASAP.
How vets diagnose and treat gastritis
Your vet will start with a physical exam and ask about what your dog may have eaten, any recent changes, and how long symptoms have been going on. Depending on what they find, they may recommend bloodwork, a urine test, X-rays, or an ultrasound to rule out infections, foreign bodies, or other underlying causes. For recurring or chronic cases, an endoscopy, where a small camera is passed into the stomach to look at the lining directly, may be needed along with biopsies to check for IBD or other conditions.
Treatment depends on the cause, but common approaches include:
- Anti-nausea medication: Maropitant (Cerenia) is most commonly used to stop vomiting.
- Stomach acid reducers: Famotidine or omeprazole help reduce acid and give the stomach lining a chance to heal.
- Sucralfate: A coating medication that protects an irritated or ulcerated stomach lining.
- IV fluids: If your dog is dehydrated from repeated vomiting.
- Bland diet: A prescription or home-prepared bland diet while the stomach recovers.
- Antibiotics or antiparasitic medication: If an infection or parasites are the cause.
For chronic gastritis, treatment is a longer conversation. Depending on the root cause, it may involve long-term dietary management, immunosuppressive drugs for IBD, or ongoing monitoring with your vet.
Does pet insurance cover gastritis in dogs?
Yes, gastritis is eligible for coverage under a Lemonade Pet accident and illness policy, as long as the condition isn’t pre-existing. That means your dog shouldn’t be showing any signs or symptoms before your policy starts or during your waiting period.
Vet visits for gastritis can add up quickly, especially if your dog needs bloodwork, imaging, medications, or IV fluids. A single emergency visit for a vomiting dog can easily run into the hundreds of dollars, and more complex cases involving endoscopy or hospitalization can go higher. Getting coverage in place while your dog is healthy is what makes it actually useful when something like this comes up.
Before we go
Most dogs with gastritis are going to be fine. A bout of garbage gut, a day of rest, a bland diet, and they’re back to stealing food off the counter like nothing happened. But some cases do need veterinary care, and knowing the red flags means you’re not left guessing at 11pm. Trust your gut (even when your dog’s isn’t cooperating). If something feels off, call your vet.
And if you want a financial safety net for moments like these, it’s worth looking into Lemonade pet insurance before your dog’s next culinary adventure.
Frequently Asked Questions
Can I treat gastritis in dogs at home?
Mild cases of acute gastritis, where your dog vomited once or twice but is still alert and hydrated, can often be managed at home by withholding food for 6 to 12 hours and then offering a bland diet in small amounts. If symptoms don’t improve within 24 hours, or if you see any red flags like bloody vomit, dehydration, or lethargy, contact your vet.
What is hemorrhagic gastritis in dogs?
Hemorrhagic gastritis in dogs refers to stomach inflammation that involves bleeding in the stomach lining. It can show up as bright red blood or dark, coffee-ground-like material in the vomit. This is a more serious form that requires prompt veterinary care.
What’s the difference between acute and chronic gastritis in dogs?
Acute gastritis comes on suddenly, usually after a dog eats something it shouldn’t, and typically resolves within 24 to 48 hours. Chronic gastritis persists for weeks or months and often signals an underlying issue like IBD, pancreatitis, or a food intolerance that needs veterinary diagnosis and ongoing management.
What bland diet is safe for a dog with gastritis?
Plain boiled chicken breast (no skin, no seasoning) mixed with plain white rice is the classic go-to. Some vets also recommend plain boiled ground turkey or a prescription gastrointestinal diet. Always introduce the bland diet in small, frequent portions and transition back to regular food gradually once your dog is keeping meals down.
How do I know if my dog is dehydrated from gastritis?
Check your dog’s gums: they should be moist and pink, not dry or tacky. You can also gently pinch the skin on the back of the neck and release it. In a well-hydrated dog, it snaps back immediately. If it stays tented or returns slowly, your dog may be dehydrated, and that’s a reason to call the vet.
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