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10 Common Causes of Dog Diarrhea and Natural Remedies to Know

10 Common Causes of Dog Diarrhea and Natural Remedies to Know

1. Sudden Dietary Changes and Dog Digestion

One of the most frequent causes of dog diarrhea is a sudden change in diet. Switching your pup’s food too quickly—whether it's a new brand, raw diet, or even a different flavor—can disrupt their gut bacteria. Transitioning slowly over 7–10 days helps avoid this. We’ve seen numerous cases at Hidden Brook Veterinary where a rushed food switch caused severe gastrointestinal upset, which could have been avoided with a gradual introduction.

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2. Food Intolerances or Allergies in Dogs

Just like humans, dogs can react to common ingredients like beef, chicken, grains, or dairy. Chronic soft stools, itching, or ear infections may all point to a dietary allergy. A limited-ingredient or elimination diet can help identify the culprit. Keep an eye on sneaky additives in treats, too—they often go overlooked.

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3. Parasites and Their Impact on Canine Gut Health

Giardia, hookworms, whipworms—these parasites are common in dogs and often contracted through contaminated water or soil. Even well-cared-for pets can pick them up at parks. Regular fecal checks are crucial. At Hidden Brook Veterinary, we recommend twice-yearly screenings, especially if your dog frequents communal areas or daycares.

4. Bacterial or Viral Infections

Infections such as parvovirus, salmonella, or campylobacter can all trigger severe diarrhea. These often come with vomiting, lethargy, or fever. Puppies and immunocompromised dogs are particularly vulnerable. If symptoms escalate or persist beyond a day, consult a vet immediately.

5. Stress and Anxiety-Induced Diarrhea

Did you just move, board your pet, or introduce a new family member? Dogs internalize stress easily, and their gut reflects it. We often see stress diarrhea after kennel stays or during holiday travel. Natural calming supplements like chamomile, CBD (vet-approved), or even a Thundershirt may help prevent recurrence.

6. Toxins or Harmful Ingestions

From chocolate to xylitol, human foods and household items can be toxic. Garbage raids, compost pile snacks, or outdoor mushrooms can all lead to sudden, watery stools or worse. Activated charcoal or inducing vomiting is only safe under veterinary supervision—don’t delay contacting your vet.

7. Chronic Conditions That Affect the Digestive System

Dogs with pancreatitis, IBD (inflammatory bowel disease), or liver issues may experience ongoing diarrhea. These require diagnostic testing and tailored management. A client’s lab mix at Hidden Brook had unexplained flare-ups for months until we diagnosed chronic pancreatitis through a special enzyme test.

While necessary for infection control, antibiotics often kill good gut bacteria alongside bad. This leads to dysbiosis—an imbalance in the microbiome—and loose stools. Probiotics like Lactobacillus acidophilus during and after treatment can help prevent this. Always ask your vet about pairing meds with supportive gut flora boosters.

Puppies have immature digestive systems, while older dogs may suffer from reduced enzyme activity or declining organ function. Both are more sensitive to dietary shifts and environmental triggers. Nutritional support tailored by life stage helps reduce digestive upset and improves overall health.

10. Exercise and Hydration Imbalances

Overexertion, especially in warm weather, can cause diarrhea in active dogs. Dehydration often follows, making the situation worse. Ensure your dog has access to fresh, clean water and doesn't go too long without shade or rest during hikes or intense play.

11. Natural Remedies and When to See a Vet

11.1 Safe At-Home Approaches

If your dog has mild diarrhea but is otherwise alert and eating, try feeding boiled chicken with plain rice, pumpkin puree (not pie filling), or slippery elm bark. Probiotics and a 12-hour fast (followed by bland meals) can also stabilize the gut.

11.2 Warning Signs Requiring Veterinary Care

See a vet immediately if your dog has:

  • Blood in stool
  • Vomiting alongside diarrhea
  • Lethargy or collapse
  • Diarrhea lasting more than 48 hours
  • Known toxin ingestion

Hidden Brook Veterinary offers same-day care for urgent digestive concerns and carries safe natural remedies to complement treatment. Never hesitate to call if you're unsure—early intervention makes all the difference.