Pepto Bismol for Dogs: Is it Safe? Dosage & Uses

Widely available over the counter as a pink oral suspension (in pink bottles), Pepto Bismol has bismuth subsalicylate as the active ingredient. It is widely used in humans to treat diarrhea, nausea, and indigestion. More and more pet owners are, however, giving this pink medicine to their dogs for the relief of diarrhea, indigestion, and upset stomach. Read on to discover everything you need to know about using Pepto Bismol for dogs.

Is Pepto Bismol Safe For Dogs?

CRITICAL SAFETY CHECK: XYLITOL WARNING

Always check the label for Xylitol (Birch Sugar): While the classic pink liquid formula rarely contains it, some ‘ultra’ or chewable formulations of bismuth subsalicylate (and many other human medications) use Xylitol as a sweetener. It is highly toxic to dogs and can cause life-threatening liver failure or seizures.

If Xylitol is listed in the ingredients, do not give it to your dog under any circumstances.

Check EVERY TIME you purchase, because manufacturers change formulations without warning. Even if a previous bottle was xylitol-free, the new one may not be. Always read the label of the specific bottle in your hand before administering.

General Safety Information

Pepto Bismol has mild anti-inflammatory, antibiotic, and antacid properties which makes it ideal for treatment of diarrhea and indigestion. A general guideline is, however, emphasized that medications and drugs formulated for human consumption should never be given to dogs and other pets, unless directed by a veterinarian, of course. This brings about the question, “can I give my dog Pepto Bismol?” among cautious pet owners.

According to veterinary guidelines originally established by PetEducation (now part of the Petco veterinary network), Pepto Bismol is generally safe for dogs but must never be given to cats. Cats tend to be particularly sensitive to the aspirin in Pepto Bismol; in fact, it can be fatal. It is, however, important that the medication is used properly to avoid adverse side effects. As a matter of fact, it is a good idea to consult with your vet before giving your dog Pepto Bismol as some dogs are not ideal candidates for this OTC medication.

As noted by Jessica Wallach, DVM, a veterinarian at New York City’s Animal Medical Center, Pepto Bismol is intended for short-term relief only and is not a long-term solution.

Important Drug Interaction Warning

While giving Pepto Bismol for dogs’ diarrhea or any other stomach related problem, it is also important that you avoid giving your dog any medication that is known to thin the blood. Aspirin is one such drug. This is because Pepto Bismol often increases the levels of salicylate in blood serum, and heightened levels of salicylate in the blood cause it to thin out. It can also cause irritation of the digestive tract. When Pepto Bismol is specifically given along with aspirin, salicylate levels of blood could rise so much as to cause salicylate poisoning. This can cause internal bleeding, tremors, seizures, troubled breathing, coma or even death.

Additionally, if your dog is taking antibiotics (especially doxycycline or other tetracyclines), separate doses by at least 2 hours, as bismuth can reduce antibiotic absorption.

Uses: Diarrhea and Upset Stomach

Now that you know that dogs can indeed have Pepto Bismol (provided it contains no xylitol), the next question is: what can you use it for?

Diarrhea

The most popular use of Pepto Bismol in humans is diarrhea treatment. It is thus not surprising that the question, “can I give my dog Pepto Bismol for diarrhea?” arises pretty often among pet owners.

Veterinary clinical protocols suggest that Pepto Bismol is used for treating diarrhea caused by dietary indiscretion as opposed to other factors such as parasitic infection. It helps to soothe the lining of the stomach and intestines which in effect stops diarrhea.

It is critical, however, to see a vet if diarrhea continues for more than 24-48 hours as this could be an indication of a more serious underlying cause. You should also watch out for fever, lethargy (your dog becomes less active and alert and appears weak), and signs of abdominal pain. These symptoms warrant the urgent attention of your vet.

Stomach Upset

Pepto Bismol is safe for relief of stomach upset (indigestion, stomachache, etc.) in most dogs. While it is a common belief that dogs eat grass specifically to induce vomiting, research suggests most dogs do not actually vomit afterward. However, grass-eating can still be a sign of mild gastrointestinal discomfort or a natural instinct to add fiber to the diet.

Vomiting

Can I give my dog Pepto Bismol for vomiting? Clinical resources maintained by the Petco network suggest that Pepto Bismol is an option for dogs with vomiting linked to dietary issues. This household medicine can in such a case help to soothe the stomach and/or intestinal lining and thus stop the vomiting. Vomiting and diarrhea tend to go hand in hand with dogs.

If using Pepto Bismol or any other bismuth subsalicylate preparation for vomiting doesn’t work within 24-48 hours, contact your vet immediately. Fever, depression, and signs of abdominal pain are also indicators that you need to take your furry companion to the vet.

How Pepto Bismol Works

The use of Pepto Bismol for dogs’ diarrhea and upset stomach (indigestion) hinges upon its ability to soothe the stomach and the intestines and thus relieve the symptoms. This household medicine draws its efficacy from the bismuth and salicylate components of the active ingredient, bismuth subsalicylate.

Bismuth works by coating the dog’s intestines, shielding them from the effects of toxins. It also has mild antibacterial properties that help neutralize harmful bacteria. In veterinary settings, bismuth compounds may also be prescribed to treat Helicobacter infections.

Salicylate has anti-inflammatory properties that help reduce the intestinal inflammation and fluid secretion that contribute to diarrhea.

Pepto Bismol Dosage for Dogs – Current Safety Guidelines

Pepto Bismol is generally safe for dogs when xylitol-free formulations are used.

According to the Merck Veterinary Manual, there is no precise established dose for animals. However, the AKC’s Chief Veterinary Officer, Dr. Jerry Klein, recommends 1 teaspoon (5 ml) per 10 pounds (~4.5 kg) of body weight, given every 6 to 8 hours.

If your dog still has diarrhea after a few doses, stop the medication and contact your veterinarian.

Dosage Chart by Weight

Dog Weight (lbs / kg)	Liquid Dose (ml / tsp)	Frequency
5 lbs (2.3 kg)	2.5 ml (½ tsp)	Every 6-8 hours
10 lbs (4.5 kg)	5 ml (1 tsp)	Every 6-8 hours
20 lbs (9 kg)	10 ml (2 tsp)	Every 6-8 hours
40 lbs (18 kg)	20 ml (4 tsp)	Every 6-8 hours
60 lbs (27 kg)	30 ml (2 Tbsp)	Every 6-8 hours
80 lbs (36 kg)	40 ml (2 Tbsp + 2 tsp)	Every 6-8 hours

Measurement Conversion Guide

Metric (ml)	US/Imperial
5 ml	1 teaspoon (tsp)
15 ml	1 tablespoon (Tbsp)
30 ml	2 tablespoons or 1 fluid ounce (fl oz)

Tip: For the most accurate dosing, ask your pharmacist for a medical oral syringe marked in ml. Kitchen spoons can vary in size and are less precise.

Important Note on Stool Color

Bismuth-related stool changes usually appear dull and thick (pasty) with a dark green or grey-black tint. In contrast, blood from the upper GI tract (melena) typically looks jet black, shiny, and sticky (like tar or coffee grounds). This is a normal chemical reaction and not a sign of internal bleeding (melena). However, this color change can mask actual bleeding, which is why short-term use is mandatory. If black stools continue after stopping Pepto Bismol, contact your vet immediately as this may indicate real bleeding.

In Case of Overdose

If you suspect your dog has received too much Pepto Bismol, contact your veterinarian or emergency animal hospital immediately. Signs of salicylate toxicity include vomiting, rapid breathing, lethargy, and loss of appetite.

Potential Side Effects & Risks

The side effects associated with using Pepto Bismol for dogs’ stomach problems are comparatively rare, especially if the proper dosage is used. Some side-effects can still be observed in some cases, including:

Common (Normal) Side Effects:

• Temporary darkening of the tongue
• Gray-black or greenish stool during the treatment phase (normal reaction to bismuth)
• Inaccurate X-ray reading: Pepto Bismol appears radio-opaque if an abdominal x-ray is performed. It can thus be mistaken for a metallic object in the body. Consequently, unnecessary surgery may be recommended. Always inform your vet if your dog has recently taken Pepto Bismol before any imaging procedures.

How to Administer Pepto Bismol Safely

To get a dog to take Pepto Bismol, a syringe (without the needle, of course) is your best method.

Step-by-step instructions:

1. Measure the appropriate dose based on your dog’s weight
2. Draw the liquid into an oral syringe
3. Gently open your dog’s mouth
4. Position the syringe at the rear end of the tongue (toward the back of the mouth)
5. Squeeze the plunger forward slowly to release the medicine gradually
6. Hold your pet’s muzzle gently for a couple seconds to ensure they swallow all the medicine

Tip: You can also mix the dose with a small amount of low-sodium chicken broth or plain yogurt if your dog resists taking it directly.

Contraindications: When Not to Use It

You should NOT give Pepto Bismol to your dog if they:

General Contraindications:

• Are allergic to either of the components in Pepto Bismol or to aspirin
• Are pregnant or nursing/breastfeeding
• Have a bleeding disorder or clotting problems
• Are currently taking aspirin or other NSAIDs (non-steroidal anti-inflammatory drugs)

Specific Medical Conditions:

• Steroid Use: Never give Pepto Bismol if your dog is currently taking steroids (like Prednisone).  This combination significantly increases the risk of severe gastric ulceration and bleeding.
• Kidney or liver disease: Salicylates can worsen these conditions
• Diabetes: Even xylitol-free formulations may affect blood sugar

Age Restrictions:

• Young Puppies: Do not administer to puppies under 6 months old without direct veterinary supervision
• Senior Dogs: Older dogs may be more sensitive to side effects; consult your vet first

Product Choice: Caplets vs. Liquid

While liquid formulations are easier to dose accurately, you must verify that the specific bottle you are using does not contain xylitol. While the classic formula is typically xylitol-free, some ‘Ultra’ or generic store-brand versions may include it.

Always verify the label of the specific bottle in your hand, as manufacturers change formulas frequently. Check both the active and inactive ingredients list every time you purchase.

For dogs under 20 pounds, liquid (xylitol-free) is generally preferred for dosing accuracy. For larger dogs, caplets may be safer to avoid xylitol exposure, but crushing and measuring can be challenging.

When to See a Veterinarian Instead

Pepto Bismol is meant for mild, temporary digestive upset only. Seek veterinary care immediately if:

• Diarrhea or vomiting persists for more than 24-48 hours
• Your dog shows signs of dehydration (dry gums, sunken eyes, lethargy)
• There is blood in the vomit or stool (red or coffee-ground appearance)
• Your dog has a fever (normal dog temperature is 100.0–102.5°F)
• Your dog shows abdominal pain (hunched posture, whining, reluctance to move)
• Your dog is lethargic or weak
• Your dog refuses food or water
• Symptoms worsen despite treatment

Remember: Pepto Bismol treats symptoms, not underlying causes. Persistent digestive issues require veterinary diagnosis.

Note from the Editors: This guide was originally authored by Dr. Winnie, DVM. It was updated to reflect current veterinary safety standards. To ensure the highest clinical standards, this post is currently in our queue for a veterinary re-review.

References

• Canine Journal: What To Give A Dog For Upset Stomach: Remedies To Settle A Sick Tummy
• Petco (Formerly PetEducation.com): Bismuth Subsalicylate (Pepto Bismol)
• PetMD: Pepto Bismol
• Whole Dog Journal: Pepto Bismol for Dogs: Can Dogs Have It & How to Use It Safely
• AnimalBiome: Can You Give a Dog Pepto-Bismol?
• AskAVet: Veterinary 2025 Guide: Pepto‑Bismol® (Bismuth Subsalicylate) for Canine GI Upset 
• Merck Veterinary Manual: Drugs Used to Treat Diarrhea in Monogastric Animals
• VCA Animal Hospitals: Bismuth Compounds
• American Kennel Club: Is Pepto-Bismol Safe For Dogs?