Dog Constipated? Why Your Dog Isn't Pooping and When to See a Vet

When it's constipation and when it's something more serious

A constipated dog usually tries to poop several times without success. Look for these signs:

Straining, circling, scooting along the floor or squatting over and over.
Small, hard, dry stools, or nothing coming out.
A little liquid or blood from the straining. It's easy to mistake for diarrhea.
Eating less, acting more tired or, in severe cases, vomiting.
Crying out while straining, or reacting when you touch the belly.

An intestinal blockage looks like constipation, but it's an emergency. It can cause vomiting, weakness, loss of appetite, pain, a bloated belly and dehydration. If the blockage is partial, there can even be watery diarrhea, because only liquid waste squeezes past.

When to see the vet

Go to the emergency vet right now if your dog:

Vomits, especially repeatedly, or vomits blood or something that smells like feces.
Is very lethargic or weak, won't eat or drink or looks dehydrated.
Has a bloated or painful belly: whining, restless, guarding the belly or stuck in the "prayer position."
Retches with nothing coming up, is restless and won't lie down (it could be bloat).
May have swallowed an object: a sock, a bone, a toy, a corn cob or string.
Cries out while straining or there's a lot of blood.

Make an appointment today if your dog is bright and eating, but:

Hasn't pooped in 24 to 36 hours.
Strains again and again with nothing to show for it.
The stools are small, hard or have mucus or blood.

The most common causes

Dehydration. Any illness or situation that dehydrates your dog can make stools hard and dry.
A sudden diet change, or eating things that can't be digested, like plant matter or bones.
Pain when pooping, for example from arthritis, or pelvic injuries or abnormalities.
Swallowed objects that block the intestine.
An enlarged prostate in intact males.
Tumors or masses in the colon or rectum.
Medications that cause constipation, like antihistamines, diuretics or opioid painkillers.
Low activity. Age, nerve problems and an underactive thyroid also play a part. Short-nosed dogs, toy breeds and Dachshunds are more prone.

If the problem drags on, the stool can pack in and lead to megacolon: the colon becomes abnormally enlarged.

What you can do at home if the constipation is mild

Only if it started less than 48 hours ago and your dog is bright and eating:

Offer canned food: it's water and food in one.
Make water easy to reach: several bowls, a fountain or ice cubes.
Take your dog for a walk to encourage a bowel movement.
Plain canned pumpkin: never pumpkin pie filling, because it can contain xylitol, which is toxic to dogs. Check with your vet about amounts and supplements.
Don't give human laxatives or enemas. Laxative suppositories, stool softeners and enemas should only be used on your vet's say-so.

If it doesn't get better within 24 hours, call your vet.

What the vet will do

They'll examine your dog, feel the belly and do a rectal exam. They'll almost always take abdominal X-rays to see how much constipation there is and whether there's a blockage, and sometimes an ultrasound and blood and urine tests.

Treatment depends on the cause. If your dog is dehydrated, they'll give fluids. They may need to remove the stool with enemas or by hand, and prescribe laxatives and a diet with more or less fiber, depending on the case. Severe cases may need surgery. For a blockage, surgery is the usual treatment: a true blockage rarely gets better on its own, and waiting makes the damage worse.

In the US, an emergency exam averages about $135, X-rays about $172 and an ultrasound about $483. A hospital stay averages about $1,323 at an emergency clinic (Synchrony/CareCredit 2025-2026 cost study). Costs vary by region and clinic. More in what a vet visit costs.

Frequently asked questions

How often should a dog poop?

An adult dog, once or twice a day. On a high-fiber diet it can be three times. Puppies go more often, usually after meals.

How long can a dog go without pooping?

More than 24 to 36 hours is a cause for concern: call your vet. If there's no bowel movement for 48 hours, the stool can pack in. Some sources say 48 to 72 hours, but if your dog is straining, vomiting or not eating, don't wait.

My dog strains but only liquid comes out. Is that normal?

It could be the liquid or blood that comes out from straining in a constipated dog, or a partial blockage. Don't write it off as diarrhea: check with your vet.

Can I give my dog pumpkin?

Plain canned pumpkin is used to help mild constipation, but never pumpkin pie filling. Check with your vet first.

How can I prevent it?

With a consistent diet, water always available, exercise and checkups every six to twelve months. Keep your dog from eating bones, trash or objects.

Sources

This article is for general information and does not replace diagnosis or treatment by a veterinarian. If you are worried about your pet's health, call your vet clinic.