Why Does My Dog Have Diarrhea?
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Diarrhea is one of the most common dog problems. Here's what causes it, what you can do at home, and when to worry.
Common causes
Most diarrhea comes from dietary indiscretion (getting into the trash or table scraps), a sudden food change, stress, or a mild infection. Parasites, allergies, and more serious illnesses are less common but possible.
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Simple home care
For a mild case in an otherwise healthy adult dog: withhold food for 12 hours (not for puppies), then offer a bland diet of plain boiled chicken and rice. A probiotic like [FortiFlora](/products/purina-fortiflora-probiotic-supplement) helps restore gut balance. Keep fresh water available to prevent dehydration.
Prevent the next episode
Transition foods slowly over 7–10 days, keep trash and toxic foods out of reach, and maintain regular parasite prevention. Stress-related diarrhea eases as routines settle.
Red flags — call the vet
Seek care promptly if you see blood, black tarry stools, repeated vomiting, lethargy, a bloated belly, or if diarrhea lasts more than a day or two. Puppies and seniors dehydrate fast and need earlier attention.
Trust your instincts
If something feels off, it's always safer to call. A quick vet visit can catch parasites or infections that home care won't fix.
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Frequently asked
- What can I feed my dog with diarrhea?
- A bland diet of plain boiled chicken and white rice is gentle on the gut. Reintroduce regular food gradually once stools firm up.
- When is dog diarrhea an emergency?
- Blood, black stools, repeated vomiting, lethargy, a swollen belly, or diarrhea lasting more than a day — especially in puppies or seniors — warrant prompt veterinary care.