Reviewed by: Medsdog Tem
Last updated: August 2026
If your furry friend is dealing with stomach problems, including indigestion, diarrhea, and gas, Pepto-Bismol (bismuth subsalicylate) may help your dog. However, knowing the correct Pepto-Bismol dosage for dogs is essential to get the benefits and avoid an overdose.
The standard Pepto-Bismol dosage for dogs is 0.5 mL per lb (approximately 1.1 mL per kg), which equals 1 teaspoon (5 mL) of liquid per 10 lbs (4.5 kg) of body weight, given every 6–8 hours.
Never give it to dogs under 10 lbs, puppies, pregnant/nursing dogs, or dogs on NSAIDs — and always confirm the dose with your veterinarian first.
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All the information in this guide is for educational purposes only and does not replace individualized veterinary advice.
Pepto-Bismol Dosage Calculator for Dogs
Enter your dog’s weight and choose a form of Pepto-Bismol to calculate the recommended dose.
Pepto Bismol For Dogs Overview
| Fact | Detail |
|---|---|
| Active ingredient | Bismuth subsalicylate |
| Standard liquid dose | 1 tsp (5 mL) per 10 lbs, every 6–8 hours |
| Standard tablet dose | ¼ of a 262 mg tablet per 20 lbs, every 12 hours |
| Minimum safe weight | Not recommended under 10 lbs |
| Max duration without vet check | 24–48 hours |
| Common side effect | Dark gray/black stool |
| Do not combine with | NSAIDs, aspirin, corticosteroids, blood thinners, tetracyclines |
What Is Pepto Bismol For Dogs?
Pepto Bismol is human medication that contain active ingredient bismuth subsalicylate, a compound that coats and soothes the stomach lining, slows fluid loss into the bowel and help in relieving temporary digestive discomfort, including upset stomach, heartburn, indigestion, nausea, and diarrhea. it also has mild antibacterial activity.
For dogs, veterinarians use Pepto-Bismol over the counter to treat mild problems, including indigestion, diarrhea, and gas.
It’s the same active ingredient found in Kaopectate, so if you’re comparing the two, our Kaopectate dosage for dogs guide breaks down how the dosing lines up.
Is Pepto Bismol Safe for Dogs?
Pepto Bismol is safe for dogs when dosed correctly, however this should be used cautiously as a temporary treatment only for short-term, mild cases not as a first-line treatment. The main concern is that salicylate component is chemically related to aspirin, which is why dosing errors and certain drug combinations can turn a mild stomach upset into a bigger problem.
How Much is the Safe Pepto Bismol Dosage for Dogs?
The Pepto-Bismol 262 mg per 15 mL / 17.5 mg–17.6 mg per mL dosage for dogs is 0.5 mL per lb (approximately 1.1 mL per kg), which equals 1 teaspoon (5 mL) of liquid per 10 lbs (4.5 kg) of body weight, given every 6–8 hours.
The 262 mg Chewable tablet Dosage will be:
| Dog weight | Equivalent tablet amount |
|---|---|
| 10 lb (4.5 kg) | ⅓ tablet |
| 15 lb (6.8 kg) | ½ tablet |
| 20 lb (9.1 kg) | ⅔ tablet |
| 30 lb (13.6 kg) | 1 tablet |
| 40 lb (18.1 kg) | 1⅓ tablets |
| 60 lb (27.2 kg) | 2 tablets |
| 90 lb (40.8 kg) | 3 tablets |
Pepto Bismol Liquid Dosage Chart for Dogs by Weight
This is the most commonly cited veterinary guideline for how much Pepto Bismol to give a dog in liquid form, based on the standard 17.5 mg/mL original-strength suspension:
| Dog Weight | Liquid Dose (tsp) | Liquid Dose (mL) |
|---|---|---|
| 10 lbs | 1 tsp | 5 mL |
| 20 lbs | 2 tsp | 10 mL |
| 30 lbs | 3 tsp | 15 mL |
| 40 lbs | 4 tsp | 20 mL |
| 50 lbs | 5 tsp | 25 mL |
| 60 lbs | 6 tsp | 30 mL |
| 70 lbs | 7 tsp | 35 mL |
| 80 lbs | 8 tsp | 40 mL |
Rule of thumb: ~1 tsp (5 mL) per 10 lbs of body weight, up to every 6–8 hours, no more than 3–4 doses in 24 hours.
So if you’re wondering how much Pepto Bismol to give a 20 lb dog, the answer is 2 teaspoons (10 mL) per dose — never more, and only after checking with your vet.
Pepto Bismol Tablets Dosage for Dogs by Weight
Tablet dosing is less forgiving than liquid because tablets can’t be measured out gradually — you’re working with fixed splits. Based on the standard 262 mg original-strength chewable tablet, the commonly used veterinary reference range is:
| Dog Weight | Tablets (262 mg each) | Frequency |
|---|---|---|
| Under 11 lbs | ¼ tablet | Not generally recommended |
| 11–21.8 lbs | ½ tablet | Every 12 hours |
| 22–54.8 lbs | 1 tablet | Every 12 hours |
| Over 54.8 lbs | 2 tablets | Every 12 hours |
Note on tablet strength: Always check your specific product’s label some “Pepto Bismol” chewable are 262 mg, and some are different strengths. If your medicine bottle lists a different mg per tablet, recalculate the dose according by using our dog bismuth subsalicylate dose calculator.
How Pepto Bismol® Help Your Furry Friend
Mild, short-term stomach upset in dogs can show up as:
- Occasional vomiting or gagging
- Mild, non-bloody diarrhea
- Gas or a gurgling stomach
- Lip-smacking or excess drooling
- Mild loss of appetite
Side Effects & Warnings
Even when taken in the right dose, Pepto Bismol can cause:
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- Black or gray stool (a benign but common effect, which however, can occur as a cover-up of the bleeding).
- Constipation or vomiting on an overdose.
- Salicylate intoxication particularly in small dogs or frequent high dose.
- Threat of interfering with diagnostic tests such as X-rays.
Signs of overdose or salicylate toxicity
(more common with repeated or oversized doses, and especially risky in small dogs):
- Vomiting or worsening diarrhea
- Constipation
- Lethargy or weakness
- Rapid breathing
- Loss of appetite
- In severe cases: seizures or collapse, this is an emergency
As soon as you realize that there are certain alarming symptoms, contact your vet.
How to Give Your Dog Pepto Bismol
Liquid:
- Shake the bottle well.
- Draw up the correct dose with an oral/pet dosing syringe (not the tiny cup that comes with the bottle — it’s hard to measure accurately for pet-sized doses).
- Gently insert the syringe toward the back of the tongue, between the cheek and back teeth.
- Push the plunger slowly and let your dog swallow between pushes. Hold the muzzle closed for a second to prevent spitting it out.
Tablets:
- Cut the tablet cleanly, using a pill cutter for accuracy on partial doses.
- Hide it in a small amount of plain food (a bit of boiled chicken works well) — use just enough to mask the taste, since too much food can add to stomach upset.
- Alternatively, place it at the back of the tongue and encourage swallowing, followed by a small treat.
When NOT to Give Pepto Bismol to Dogs
The Pepto Bismol must not be administered to dogs who:
- Are puppies under ~12 weeks old.
- Are pregnant or nursing.
- Bleeding problems or taking blood thinners/ NSAIDs.
- On doxycycline or tetracycline (may interact).
- Display extreme symptoms such as bloody diarrhea, lethargy or dehydration.
Drug Interactions
| Medication Type | Examples | Risk |
|---|---|---|
| NSAIDs | Carprofen, meloxicam, deracoxib | Increased risk of GI bleeding |
| Salicylates | Aspirin | Additive toxicity risk |
| Anticoagulants | Warfarin, heparin | Increased bleeding risk |
| ACE inhibitors | Enalapril, benazepril | May affect absorption/kidney function |
| Diuretics | Furosemide | Interaction risk, use with caution |
| Tetracyclines | Doxycycline, tetracycline | Reduced antibiotic absorption |
| Corticosteroids | Prednisone, dexamethasone | Increased GI bleeding risk |
If your dog’s diarrhea is being treated with an antibiotic like metronidazole, timing matters bismuth can interfere with how well other oral medications are absorbed. Our Metronidazole dosage for dogs calculator covers spacing doses correctly when combining GI treatments.
What If Pepto Bismol Doesn’t Work?
Pepto Bismol is meant for mild, short-term stomach upset only. If your dog doesn’t improve within 24–48 hours, or the diarrhea/vomiting is more than mild, it’s time to see a vet rather than increasing the dose.
Depending on the underlying cause, a veterinarian may recommend:
- Famotidine (Pepcid) for acid-related stomach issues
- Omeprazole for longer-term acid suppression see our Omeprazole guidlines for how these compares to short-term antacids
- Sucralfate to coat and protect ulcerated tissue
- Oral rehydration support if your dog has lost fluids from diarrhea or vomiting our guide on Pedialyte for dogs treatment covers safe rehydration amounts
- A prescription antidiarrheal note that loperamide (Imodium) is not interchangeable with Pepto Bismol and carries its own breed-specific risks; see Imodium benefits for canines before considering it
- A bland diet of boiled chicken and rice, smaller and more frequent meals, and probiotics
If you’re managing your dog’s diarrhea using the base compound directly rather than the branded product, our bismuth subsalicylate dosage guide uses the same veterinary dosing standard covered here.
FAQs
Can dogs take Pepto Bismol for diarrhea?
Yes, in mild cases, under vet guidance — typically one dose every 6–8 hours based on the dog’s weight.
How much Pepto Bismol for dogs in mL?
The general liquid dose is about 5 mL per 10 lbs of body weight.
Is Pepto Bismol safe for pregnant dogs?
No, it’s not recommended for pregnant or nursing dogs due to potential risks.
How long can I give Pepto Bismol to my dog?
Usually no more than 24–48 hours without checking with a vet.
Can ivermectin be given without a vet?
Never administer ivermectin to your dog without veterinary guidance; dosing varies widely based on condition, and misuse can be harmful.
Final Thoughts
Used correctly and briefly, Pepto Bismol can take the edge off a dog’s mild stomach. Weigh your furry friend accurately, use the dosage chart or calculator above rather than eyeballing it, avoid it entirely if your dog is on other medications or is pregnant, and treat 24–48 hours as your hard deadline for calling the vet if things haven’t improved.
