Updated September 21, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: Acid reflux in dogs happens when stomach acid flows back up into the esophagus (the tube between the mouth and stomach). Mild episodes may cause no obvious signs, but repeated reflux can inflame the esophagus, a condition called esophagitis. Common signs include regurgitating food, drooling, repeated swallowing or lip-licking, and a reduced appetite. Your veterinarian can confirm what’s going on and, if needed, prescribe medication to reduce stomach acid and protect the esophagus, usually along with diet changes like smaller, lower-fat meals.
What is acid reflux in dogs?
Veterinarians usually call it gastroesophageal reflux (GER). A ring of muscle at the bottom of the esophagus, the lower esophageal sphincter, normally keeps stomach contents where they belong. When that muscle relaxes at the wrong time or doesn’t close well, acid and digestive enzymes can wash back into the esophagus.
An occasional episode may not cause any lasting problems. When reflux happens often or is severe, the acid irritates the lining of the esophagus and can cause esophagitis. Mild esophagitis may cause few or no signs, while severe cases can damage deeper layers of the esophagus and, rarely, lead to scarring and narrowing (an esophageal stricture).
Signs of acid reflux in dogs
Dogs can’t tell us they have heartburn, so reflux shows up as changes in eating and behavior. Signs your veterinarian will ask about include:
- Regurgitation: bringing up food or liquid effortlessly, often soon after eating
- Drooling more than usual
- Repeated swallowing, gulping, or lip-licking
- Reduced appetite, or seeming hungry but hesitating to eat
- Discomfort when swallowing, or stretching out the head and neck
- Low energy or seeming “off”
- In some dogs, a chronic cough
These signs overlap with other problems, including something stuck in the esophagus, an esophageal stricture, and megaesophagus, which is why a veterinary exam matters rather than assuming it’s reflux.
Regurgitation vs. vomiting: why the difference matters
Regurgitation is passive. Food or fluid simply comes back up, often undigested and sometimes tube-shaped, with little or no warning. Vomiting is active, with heaving and abdominal effort, and the material usually comes from the stomach. Reflux and esophageal problems tend to cause regurgitation, while vomiting points toward the stomach, intestines, or a problem elsewhere in the body. Telling your vet which one you’re seeing (a short video helps) can speed up the diagnosis.
What causes acid reflux in dogs?
Reflux often has more than one contributing cause. Common ones include:
- Anesthesia. This is one of the most common causes. Anesthetic drugs relax the lower esophageal sphincter, and how long a dog fasted beforehand, body position during surgery, and the anesthetic protocol can all influence the risk. Signs of esophagitis may appear in the days after a procedure.
- Chronic or repeated vomiting. Frequent vomiting exposes the esophagus to stomach acid again and again.
- Hiatal hernia. Part of the stomach slides up through the diaphragm. Short-nosed (brachycephalic) breeds such as French Bulldogs, English Bulldogs, and Pugs are over-represented, and breathing effort from their airway anatomy may contribute.
- Certain medications. Some drugs lower the tone of the lower esophageal sphincter, and a few, such as doxycycline, can irritate the esophagus directly.
- High-fat meals. Fat slows how quickly the stomach empties, which can make reflux more likely.
- Age. Puppies may be at higher risk because the sphincter is still developing.
- Feeding tubes that pass through the junction of the esophagus and stomach.
When to see a vet
Book an appointment if your dog regurgitates more than occasionally, keeps lip-licking or swallowing, or is eating less. Contact your veterinarian or an emergency clinic right away if your dog:
- Vomits or regurgitates repeatedly, or can’t keep water down
- Brings up blood, or has black, tarry stools
- Coughs, breathes fast, or struggles to breathe after regurgitating (inhaled stomach contents can cause aspiration pneumonia)
- Seems to be in pain, won’t eat for more than a day, or is weak and lethargic
- Has these signs after anesthesia or after chewing or swallowing something
How vets diagnose it
Your veterinarian will start with a history and physical exam. Depending on the signs, next steps may include bloodwork, X-rays, or a contrast study to look for foreign objects, a hiatal hernia, or an enlarged esophagus. Endoscopy, where a small camera is passed into the esophagus under anesthesia, is the most direct way to see inflammation, ulcers, or strictures. Mild cases are sometimes treated first and the response is used to guide next steps.
Treatment options
Treatment depends on the cause and severity. Mild esophagitis may need no treatment at all. When signs are present, veterinarians generally aim to reduce stomach acid, protect the esophagus, help the stomach empty, and control pain. Your vet may prescribe:
- Acid reducers. Proton pump inhibitors (PPIs) such as omeprazole are the most effective drugs for reducing stomach acid in dogs, according to the American College of Veterinary Internal Medicine (ACVIM). H2 blockers such as famotidine are weaker, and research shows their effect fades when they’re given every day for a stretch of time, so vets choose between them based on the situation.
- Esophageal protectants. Sucralfate, often given as a liquid slurry, can coat and protect irritated tissue.
- Motility drugs. Medications such as cisapride or metoclopramide can tighten the lower esophageal sphincter and help the stomach empty faster.
- Pain relief when the esophagus is sore.
- Treating the underlying cause, such as managing a hiatal hernia, the reason for chronic vomiting, or a medication that’s contributing.
Acid reducers aren’t harmless to use indefinitely. Veterinary specialists have warned that they’re over-prescribed and that stopping some of them suddenly can cause rebound acid. Your vet will set the drug, dose, and length of treatment for your dog and tell you how to taper off if needed.
Please don’t give human antacids or heartburn medicine without talking to your vet first. Doses for dogs are different, combination products can contain ingredients that aren’t safe for dogs, and some sugar-free products contain xylitol, which is toxic to dogs. Human pain relievers such as ibuprofen and naproxen can cause stomach ulcers in dogs and should never be given for “tummy trouble.”
Diet and home care
Diet changes are a core part of managing reflux, usually alongside any medication your vet prescribes:
- Feed small, frequent meals instead of one or two large ones.
- Choose soft food that’s low in fat and fiber while the esophagus heals. Your vet may recommend a prescription gastrointestinal diet.
- Skip fatty treats and table scraps, which slow stomach emptying.
- Help your dog reach a healthy weight if they’re overweight.
- Tell your vet about reflux before any future anesthesia so they can plan fasting and medications to lower the risk.
Outlook
Most dogs with mild reflux do well once the cause is addressed and meals are adjusted. Severe esophagitis takes longer to heal and needs close follow-up, because scarring can narrow the esophagus. If your dog starts regurgitating more, has trouble swallowing, or loses weight during or after treatment, let your vet know promptly.
Frequently asked questions
Can I give my dog Pepcid (famotidine) for acid reflux?
Famotidine is used in dogs, but only give it if your veterinarian recommends it and tells you the dose. It may not be the best choice for your dog, its effect fades with daily use, and some store-bought versions are combination products that aren’t appropriate for dogs.
Can dogs take Tums?
Check with your vet first. Veterinary specialists have found little evidence that over-the-counter antacids like calcium carbonate help reflux in dogs, and your vet may suggest a better option.
Is acid reflux in dogs serious?
Often it’s mild and manageable. It becomes serious when it causes severe esophagitis, a stricture, or aspiration pneumonia, which is why ongoing signs deserve a vet visit.
Why does my dog get reflux after surgery?
Anesthesia relaxes the muscle that keeps stomach contents out of the esophagus. If your dog regurgitates, drools, or won’t eat in the days after a procedure, call the clinic that performed it.
Sources
- Merck Veterinary Manual: Esophagitis in Small Animals
- Merck Veterinary Manual: Disorders of the Esophagus in Dogs
- Marks SL et al. ACVIM consensus statement: Support for rational administration of gastrointestinal protectants to dogs and cats. J Vet Intern Med, 2018
- MSPCA-Angell: Review of the ACVIM consensus on gastric protectants
- Incidence of gastroesophageal reflux in dogs undergoing orthopaedic surgery or upper GI endoscopy (PMC)
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.