Dog Constipation: Causes, Signs, and What to Do

What It Looks Like

Constipation in dogs means infrequent, difficult, or absent bowel movements. A healthy dog typically poops one to three times per day, depending on diet and activity level. You may notice your dog squatting and straining for extended periods with little or no result, circling repeatedly before attempting to defecate, or producing small, hard, dry pellets instead of normal formed stools.

It is important to distinguish constipation from obstipation (severe, complete inability to pass stool) and tenesmus (straining that can occur with diarrhea, urinary issues, or colitis). A dog straining to defecate and producing small amounts of liquid stool may actually have diarrhea with colonic irritation, not constipation. Watch for accompanying signs like loss of appetite, vomiting, abdominal discomfort, or scooting.

Common Causes

The most frequent reasons dogs become constipated include:

• Dehydration — insufficient water intake causes the colon to absorb too much moisture from stool, making it hard and difficult to pass. Dehydration can result from not drinking enough, excessive panting, diarrhea, or kidney disease.
• Dietary issues — a diet too low in fiber slows intestinal transit. Conversely, ingesting bones, hair, grass, or other indigestible material can create hard, chalky stool or obstruct the colon.
• Intestinal obstruction — swallowed toys, fabric, corn cobs, or bones can partially or completely block the intestine. This is a surgical emergency if complete obstruction occurs.
• Enlarged prostate — in intact (unneutered) male dogs, benign prostatic hyperplasia presses on the rectum and makes defecation painful and difficult. Prostate tumors can cause similar symptoms.
• Medication side effects — opioid pain medications, antihistamines, diuretics, some antacids (aluminum-containing), and iron supplements can all cause constipation.
• Orthopedic pain — dogs with hip dysplasia, arthritis, or spinal issues may avoid the squatting position needed to defecate because it causes pain.
• Neurological conditions — spinal cord injuries or disease can impair the nerve signals needed for normal bowel function.
• Pelvic injuries or tumors — any mass or narrowing in the pelvic canal can physically obstruct the passage of stool.

When It's an Emergency

Seek emergency veterinary care immediately if your dog shows any of these signs:

• No bowel movement for 3 or more days with vomiting — this combination suggests a possible intestinal obstruction, which can be life-threatening without surgical intervention.
• Distended, taut, or painful abdomen — bloating combined with inability to defecate may indicate obstruction or another abdominal emergency.
• Straining with blood or bloody mucus — can indicate colonic damage, a tumor, or a foreign body causing internal injury.
• Collapse, severe lethargy, or pale gums — systemic signs alongside constipation may indicate shock from an obstruction or internal bleeding.
• Known ingestion of a foreign object — if your dog swallowed a sock, bone, toy, or other object and is now unable to defecate, obstruction should be ruled out immediately.

When to See the Vet

Schedule a veterinary visit within 24–48 hours if your dog:

• Has not had a bowel movement in more than 48 hours
• Is straining repeatedly with little or no stool produced
• Is lethargic or has lost their appetite alongside constipation
• Is an intact male dog having difficulty defecating (prostate issues)
• Has chronic or recurring constipation
• Is on medications that may be contributing to constipation

Home Care Steps

If your dog has mild constipation (slightly hard stools or a skipped bowel movement) but is otherwise eating, drinking, and acting normally, try these steps:

1. Increase water intake — ensure fresh water is always available. Adding warm water or low-sodium chicken broth (no onion or garlic) to your dog's food increases hydration.
2. Add fiber to the diet — plain canned pumpkin (not pumpkin pie filling) is an excellent source of soluble fiber. Give 1–4 tablespoons per meal depending on your dog's size. Psyllium husk powder (unflavored Metamucil) can also help at a dose recommended by your vet.
3. Encourage exercise — physical activity stimulates intestinal motility. Even a 15–20 minute walk can help get things moving.
4. Remove bones from the diet — if your dog has been eating raw or cooked bones, stop immediately. Bone fragments create hard, chalky, cement-like stool that is very difficult to pass.
5. Try a stool softener — a small amount of coconut oil (1/2 to 1 teaspoon per 10 pounds of body weight) mixed into food can help soften stool. Do not give human laxatives without veterinary guidance.

Do not give your dog enemas, mineral oil by mouth, or human laxatives (such as MiraLAX or Ex-Lax) without consulting your veterinarian first. Mineral oil given orally can be accidentally inhaled into the lungs, causing aspiration pneumonia.

Prevention

• Ensure adequate hydration — always provide access to fresh, clean water. Consider a pet water fountain to encourage drinking.
• Feed a balanced, fiber-appropriate diet — high-quality commercial dog foods generally contain adequate fiber. Avoid feeding excessive amounts of bones.
• Maintain regular exercise — daily walks and play keep the digestive system functioning normally.
• Keep the yard clean — prevent your dog from eating grass, rocks, or other foreign material during outdoor time.
• Consider neutering intact males — neutering eliminates benign prostatic hyperplasia, a common cause of constipation in older intact male dogs.
• Manage arthritis and pain — if your senior dog has joint pain making it difficult to squat, work with your vet on a pain management plan so they can defecate comfortably.

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