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Get your pet's plan
Get your pet's plan

Dog diarrhea: when to wait, when to worry, when to call the vet

Call your vet or an emergency clinic now if:

  • Bloody diarrhea: bright red blood, dark tarry stool (melena), or jelly-like blood mucus. Or diarrhea more than twice in a day
  • Severe lethargy or collapse
  • Vomiting alongside diarrhea for more than a few hours, especially in puppies (rapid dehydration)
  • Suspected toxin ingestion (chocolate, xylitol, plants; see AVMA household hazards list)
  • Puppy under 6 months with diarrhea: they dehydrate fast and parvovirus is a real risk if vaccination is incomplete
  • Diarrhea with fever, severe abdominal pain, or distended belly

For suspected poisoning in the US, call ASPCA Animal Poison Control at 888-426-4435 (a fee may apply).

For suspected poisoning in Canada, call Pet Poison Helpline at 855-764-7661 (a fee applies).

For suspected poisoning in the UK, call Animal PoisonLine at 01202 509 000 (a fee applies).

For suspected poisoning in Australia, call Animal Poisons Helpline at 1300 869 738 (a fee applies).

For suspected poisoning in New Zealand, call Animal Poisons Helpline at 0800 869 738 (a fee may apply).

For suspected poisoning in France, call Centre Antipoison Animal at 02 40 68 77 40 (no charge) or CNITV at 04 78 87 10 40. Both are open 8:30 am to midnight. Outside those hours, call your vet or the nearest emergency veterinary clinic.

For suspected poisoning in Spain, call your vet, or the Servicio de Información Toxicológica at 91 562 04 20 (open 24 hours). It is a poison centre for people that also advises on animals, so say the call is about your pet.

For suspected poisoning in Italy, call your vet, or the Centro Antiveleni di Milano at 02 6610 1029 (open 24 hours). It is a poison centre for people that also advises on animals, so say the call is about your pet.

If you think your pet ate something toxic, call your vet or the nearest emergency veterinary clinic now.

Animal poison lines in other countries
  • For suspected poisoning in the US, call ASPCA Animal Poison Control at 888-426-4435 (a fee may apply).
  • For suspected poisoning in Canada, call Pet Poison Helpline at 855-764-7661 (a fee applies).
  • For suspected poisoning in the UK, call Animal PoisonLine at 01202 509 000 (a fee applies).
  • For suspected poisoning in Australia, call Animal Poisons Helpline at 1300 869 738 (a fee applies).
  • For suspected poisoning in New Zealand, call Animal Poisons Helpline at 0800 869 738 (a fee may apply).
  • For suspected poisoning in France, call Centre Antipoison Animal at 02 40 68 77 40 (no charge) or CNITV at 04 78 87 10 40. Both are open 8:30 am to midnight. Outside those hours, call your vet or the nearest emergency veterinary clinic.
  • For suspected poisoning in Spain, call your vet, or the Servicio de Información Toxicológica at 91 562 04 20 (open 24 hours). It is a poison centre for people that also advises on animals, so say the call is about your pet.
  • For suspected poisoning in Italy, call your vet, or the Centro Antiveleni di Milano at 02 6610 1029 (open 24 hours). It is a poison centre for people that also advises on animals, so say the call is about your pet.

If you think your pet ate something toxic, call your vet or the nearest emergency veterinary clinic now.

Otherwise, the rest of this page helps you decide what to do.

Loose stools are one of the most common reasons people search online about their dog. Most one-off diarrhea resolves on its own. Some doesn’t, and the difference matters.

This post is a decision framework, not medical advice. See the “when to take to vet” framework for broader context. If your dog is showing red flags below, call your vet now.

First decision: emergency, urgent, or wait-and-see

Emergency (call now or go to ER):

  • Bloody diarrhea: bright red blood, dark tarry stool (melena), or jelly-like blood mucus. The Merck Veterinary Manual lists bloody diarrhea under “see a veterinarian immediately”.
  • Diarrhea more than twice in a day. The AVMA lists more than two episodes of diarrhea in a 24-hour period among emergencies that need a vet right away.
  • Severe lethargy or collapse.
  • Vomiting alongside diarrhea for more than a few hours, especially in puppies (rapid dehydration).
  • Suspected toxin (chocolate, xylitol, plants; see the AVMA household hazards list).
  • Puppy under 6 months with diarrhea: they dehydrate fast and parvovirus is a real risk if vaccination series is incomplete.
  • Diarrhea with fever, severe abdominal pain, or distended belly.

Urgent (call regular vet within 24h):

  • Diarrhea continues into a third day. VCA Animal Hospitals and the Cornell Riney Canine Health Center both say to call your vet if loose stools last more than two days.
  • Dog is acting subtly off (less playful, less interested in walks).
  • Diarrhea after a known dietary change or human food incident.
  • Watery stool, even once or twice. See your vet today or tomorrow. More than twice in a day moves it to the emergency list above.

Wait-and-see (with bland food + monitoring):

  • One or two loose stools that are soft, not watery, and the dog is otherwise normal: eating, drinking, playing.
  • Recent stress event (boarding, travel, thunderstorms, new home).
  • Recent dietary change you can correct.

Bland diet protocol (only for wait-and-see cases)

Only use this if your dog is in the wait-and-see category above and your vet has not advised otherwise.

  1. A short break from food, if your vet agrees. The Cornell Riney Canine Health Center describes withholding food for 12 to 24 hours before a bland diet. Water always available. Ask your vet before fasting a puppy, a small dog or a dog with a health condition.
  2. Boiled chicken and plain white rice in small portions. Your vet can tell you how much and how often for your dog.
  3. Slowly reintroduce regular food, mixing it with the bland food in a higher proportion each meal.
  4. Stools back to normal? Back to normal feeding.
  5. Not resolved within two days, or anything new (watery stool, vomiting, low energy, no appetite)? Vet visit. Any blood, or diarrhea more than twice in a day: call your vet or an emergency clinic now.

Note: bland diet is short-term only. Chicken and rice is not nutritionally complete for ongoing feeding.

Common non-emergency causes

  • Sudden food change. Always transition gradually.
  • Eating human food. Pizza crusts, butter, fatty leftovers: pancreatitis territory.
  • Garbage gut. Got into the trash, ate something rotten.
  • Treat overload. Especially rich treats, bones, or high-fat chews.
  • Boarding, kennel stays, new home, separation anxiety. Stress colitis is real and often settles quickly. If it does not, call your vet.

Common urgent causes (vet within 24h)

Infection / parasites

  • Giardia, Coccidia, hookworms, whipworms. Common in puppies and dogs from rescue settings. Stool sample to vet.
  • Bacterial infections (Salmonella, Campylobacter).

Medical conditions

  • Inflammatory bowel disease (IBD).
  • Pancreatitis (especially after fatty meals).
  • Liver, kidney, or pancreatic disease.
  • Allergies / food intolerance.

Common emergency causes

What to note for your vet

Things to note:

  • Number and consistency of stools (soft but formed, shapeless, watery).
  • Timing: morning, after meals, overnight.
  • Any blood, mucus, color changes.
  • Energy, appetite, water intake.
  • Recent diet changes, treats, anything new.

Have ready for the visit:

  • Deworming schedule (last fecal test, last broad-spectrum dewormer).
  • Vaccination history including parvo / DHPP boosters.
  • Past episodes: was there a similar bout 6 weeks ago?

When the vet asks “how long has this been going on” you have an answer that doesn’t start with “uh”.

What not to do

  • Don’t give human anti-diarrheals without vet approval.
  • Don’t withhold water. Dehydration is the main risk.
  • Don’t ignore lethargy or fever. Those convert wait-and-see into emergency fast.

FAQ

My dog has diarrhea but is acting normal. Should I worry?

If they’re eating, drinking, energetic, and not in pain, many mild cases settle with a bland diet. Track stool consistency. VCA Animal Hospitals and the Cornell Riney Canine Health Center both say to call your vet if loose stools last more than two days. Call sooner if anything else changes. Watery stool is a vet visit today or tomorrow. More than twice in a day, or any blood, is a call now (AVMA, Merck Veterinary Manual).

What does the color of dog diarrhea mean?

  • Yellow / greenish: often bile-related, fast transit time.
  • Black / tarry (melena): digested blood from the upper GI. Vet now.
  • Bright red blood: lower GI bleeding. Vet now.
  • White / pale: possible liver or pancreatic issue. Vet within 24h.
  • Brown with mucus: colitis-pattern, often stress or mild infection.

Color alone does not tell you the cause. Tell your vet what you saw.

Can I give my dog a human stomach remedy?

Never on your own. Some human products contain ingredients that are toxic to dogs, and the right product and amount are for your vet to decide. Call your vet before giving anything.

How long is too long for dog diarrhea?

More than two days of loose stools (VCA Animal Hospitals, Cornell Riney Canine Health Center), or any diarrhea with other symptoms (low energy, off food, vomiting, black or bloody stool), is a vet call. Watery stool is a vet visit today or tomorrow. Diarrhea more than twice in a day, or any blood, is an emergency: call now (AVMA, Merck Veterinary Manual). Puppies and seniors get less time. Call on day one if they’re off baseline.

Why does my dog get diarrhea every time we travel?

Stress colitis: common, usually self-limiting. Talk to your vet about pre-travel prevention (probiotics, anti-anxiety meds for severe cases).

Related

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