Dog symptom
Constipation in dogs
Straining to poop, hard dry stools, or going less often than usual. Often diet- or hydration-related, but ongoing constipation (especially in cats) can signal a blockage or megacolon.
Common causes of constipation in dogs
- Low fiber, dehydration, or too little exercise
- Swallowed hair, bones, or foreign material
- Pain that makes posturing hard (arthritis, anal gland problems)
- In cats, megacolon; in male dogs, an enlarged prostate
Who's most at risk
- Senior and arthritic pets
- Cats with a history of megacolon
- Low-water, low-fiber diets
- Long-haired pets (ingested hair)
What you can do at home
- Make sure fresh water is always available
- Ask your vet about adding fiber (e.g., a little plain pumpkin) or more exercise
- Never give human laxatives or enemas — some are toxic to pets
When to see a vet
- No stool for more than 48–72 hours, or repeated unproductive straining
- You can't tell it apart from straining to urinate (that is an emergency)
- Also vomiting, a painful belly, or low energy
- Only small hard pellets, or blood, after a lot of effort
When it's more serious
- Straining to urinate — especially in a male cat — is a life-threatening emergency. Go now.
- Constipation with vomiting or pain can mean an obstruction — see a vet today.
- Several days without a bowel movement warrants a vet visit.
What your vet may do
- Exam and feel the abdomen; check the rectum and anal glands
- X-rays to assess the stool load or a blockage
- Fluids, an enema, or stool softeners as appropriate
- Diet and long-term management for recurring cases
Questions to ask your vet
- Is this constipation or a urinary blockage?
- Could there be an obstruction?
- What diet or fiber plan helps long-term?
- How do I prevent it recurring?
Frequently asked questions
What causes constipation in dogs?
Straining to poop, hard dry stools, or going less often than usual. Often diet- or hydration-related, but ongoing constipation (especially in cats) can signal a blockage or megacolon. Common causes include: Low fiber, dehydration, or too little exercise; Swallowed hair, bones, or foreign material; Pain that makes posturing hard (arthritis, anal gland problems); In cats, megacolon; in male dogs, an enlarged prostate.
Is constipation in dogs an emergency?
Book a veterinary visit soon. See a vet right away if: No stool for more than 48–72 hours, or repeated unproductive straining; You can't tell it apart from straining to urinate (that is an emergency); Also vomiting, a painful belly, or low energy; Only small hard pellets, or blood, after a lot of effort.
What can I do at home for a dog with constipation?
Make sure fresh water is always available Ask your vet about adding fiber (e.g., a little plain pumpkin) or more exercise Never give human laxatives or enemas — some are toxic to pets
Sources
Reviewed by the Webvet Veterinarian Team
This guide is general information, not a diagnosis, and does not replace an exam by your veterinarian. If your pet is in distress, contact your vet or an emergency clinic right away.