Dog Diarrhea: Causes, Home Care, and When to Call the Vet

Quick Answer: Watch and Assess

One episode of loose stool in an otherwise alert dog is usually not an emergency. Bloody diarrhea, diarrhea with vomiting, or diarrhea in a puppy or senior dog warrants prompt vet attention.

Not sure how serious this is?Use the Symptom Checker →

Diarrhea is one of the most common dog health complaints. It's your dog's digestive system trying to clear something out fast. The cause is usually minor, but persistent or severe diarrhea can lead to dangerous dehydration.

Most Common Causes

Dietary change or indiscretion (common)

Switching food too fast, eating table scraps, getting into trash. Most common cause.

Viral or bacterial gastroenteritis (common)

Infection from parvovirus, coronavirus, Salmonella, Campylobacter. Often includes vomiting and lethargy.

Intestinal parasites (common)

Roundworms, hookworms, whipworms, Giardia, Coccidia. Common in puppies. May see mucus or blood in stool.

Stress colitis (moderate)

Diarrhea triggered by stress events: boarding, travel, fireworks, change in routine. Often large-bowel diarrhea with mucus or blood.

Food intolerance or allergy (moderate)

Chronic recurring diarrhea that improves on an elimination diet. Common allergens: chicken, beef, dairy, wheat.

Inflammatory bowel disease (IBD) (rare)

Chronic inflammation of the GI tract. Intermittent diarrhea, weight loss, vomiting.

Wait, Act, or Emergency?

You Can Watch and Wait If:

Single loose stool, dog is alert and eating
Soft stool after a diet change
Mild diarrhea with no blood, mucus, or vomiting
Dog is drinking water and acting normally

Call or Visit Your Vet If:

Diarrhea persists beyond 48 hours
Diarrhea with vomiting at the same time
Puppy or senior dog with diarrhea (dehydrate quickly)
Dog seems lethargic, painful, or has a fever
Mucus-heavy or bloody stools

Go to Emergency Vet Immediately If:

Bright red blood or black tarry stools (possible internal bleeding)
Signs of severe dehydration: dry gums, skin that doesn't bounce back when pinched, sunken eyes
Diarrhea with bloated abdomen
Puppy with bloody diarrhea -- could be parvovirus, a true emergency

Stress is a major diarrhea trigger. If your dog has anxiety issues, see our guide

Still not sure what to do?

Our interactive checker walks you through symptoms, severity, and duration -- and gives you a clear go/wait/monitor answer.

Open Symptom Checker

Frequently Asked Questions

Can I give my dog Pepto-Bismol for diarrhea?

Pepto-Bismol contains salicylate (related to aspirin), which can be harmful to dogs. Do not give it without specific veterinary guidance. Plain canned pumpkin (not pie filling) at 1-4 tablespoons depending on size is a safe fiber supplement for mild diarrhea.

How much water should I give a dog with diarrhea?

Keep fresh water available at all times. Dogs with diarrhea lose a lot of fluid. If your dog won't drink, try offering low-sodium chicken broth. If the dog is vomiting and can't keep water down, see a vet promptly.

How long does dog diarrhea usually last?

Most dietary-cause diarrhea resolves within 24-48 hours with a bland diet. Infectious causes may take 3-5 days with treatment. Anything beyond 5-7 days needs veterinary workup.

Is it normal for diarrhea to have mucus in it?

Some mucus is normal. Large amounts of mucus, especially with straining, suggest inflammation of the large intestine (colitis). Common causes are stress, dietary change, or parasites.

Can I use Imodium for dog diarrhea?

Imodium (loperamide) can be used in some dogs under veterinary guidance, but it's dangerous for certain breeds (especially Collies and other MDR1-mutation dogs) and should never be given to puppies. Always check with your vet first.

Is Your Dog an American Bulldog?

American Bulldogs have breed-specific health vulnerabilities. ABRA-registered dogs from health-tested lines have better documented health histories.

Search American Bulldog Pedigrees ABRA Registry