Bowel Obstruction in Dogs

Causes of Bowel Obstruction

• Swallowed objects (foreign bodies), the most common cause: toys, socks and clothing, rocks, corn cobs, bones, plastic and fruit pits.^2,1,4 Young, large-breed dogs are most often affected.³ See what to do if your dog ate something.
• Linear objects, such as string, thread, ribbon, tinsel or fabric strips. They bunch up the intestine and can cut through it, so they carry a higher risk of perforation.^1,2,12
• Intussusception, where one part of the bowel slides into the next. It's more common in young dogs and causes vomiting, belly pain and small amounts of bloody diarrhea.^3,1
• Tumors in or around the bowel wall.^1,3
• Twisted bowel (volvulus), hernias and other problems that trap or kink the intestine.¹

Signs of an Intestinal Blockage in Dogs

• Vomiting, the most common sign, seen in 82% of dogs in one study. It may be less frequent when the blockage is far down the intestine.^4,1
• Not eating and lethargy^3,2
• Belly pain^4,3
• Little or no poop, or straining. About a third of dogs in one study had stopped passing stool.^4,6
• Diarrhea, which can happen with a partial blockage^3,2
• Dehydration, weakness and, later, shock^3,1

Signs depend on where the blockage is, how complete it is and how long it's been there.^2,5 Some swallowed objects cause no signs at first.⁷

Partial vs Complete Blockage

Large, round objects often cause a complete blockage, while small or string-like objects more often cause a partial one.¹ With a partial blockage, a dog may still pass some stool or diarrhea and may still eat a little, with vomiting that comes and goes.^1,13 So a dog that's still pooping can still have a blockage. Some partial blockages pass with fluids and close monitoring in the hospital, but surgery is needed if the object doesn't move on within about 36 to 48 hours, or if the dog gets worse.^1,2,5

Why a Blockage Is an Emergency

A blockage stretches the bowel and can squeeze its blood vessels. Blood flows in but can't drain out, so the bowel wall swells, loses oxygen and can die. Gut bacteria then pass through the damaged wall, and the bowel may tear, leading to peritonitis, sepsis and shock.^1,5 There's no fixed timeline for how fast this happens. It depends on the object, where it's lodged and how tightly it presses on the bowel. Outcomes are best when the blockage is found and removed promptly.^2,1

Diagnosis

Your vet will ask what your dog might have eaten and examine its belly. X-rays can show many objects and the pattern of gas-filled bowel loops a blockage causes, and ultrasound can show the object itself and fluid-filled loops. Using both gives the most accurate answer.^3,14,5 Some objects, such as wooden skewers, don't show well on x-rays, so a contrast study, repeat x-rays or CT may be needed. Bloodwork shows dehydration and other problems.^15,3,2,5 Sometimes the only way to be sure is exploratory surgery.²

Treatment

• Endoscopy: a camera passed down the throat can retrieve many objects from the esophagus and stomach without surgery. In a 2023 study, it worked in 87% of dogs.^16,1
• Gastrotomy or enterotomy: the surgeon opens the stomach or intestine, removes the object and closes the incision.^2,13
• Resection and anastomosis: if part of the bowel is dead or torn, the surgeon removes it and joins the healthy ends. This carries a higher risk of leaks and death.^2,4,8

Before surgery, dogs get IV fluids to correct dehydration. Afterward, they usually stay in the hospital on IV fluids and monitoring for at least 12 to 24 hours, and starting food early helps the bowel heal.^5,1

Recovery and Survival

The outlook after foreign body surgery is usually good, especially when the object is removed quickly and the bowel is healthy.^5,1 The biggest risk is the repair leaking, which most often happens 3 to 5 days after surgery and usually needs a second operation.^2,5,1 Call your vet right away if your dog starts vomiting again, stops eating, seems painful or becomes lethargic in the first week. Dogs that already have peritonitis before surgery do worse: in a 2023 study of 61 dogs operated on for septic peritonitis, about half survived to go home.^17,10

How Much Does Blockage Surgery Cost?

Embrace Pet Insurance reports that surgery to remove a swallowed object typically costs $1,600 to over $12,000 in the US, and non-surgical care $300 to $1,200.¹⁸ Trupanion's average foreign body claim for pets was $1,355 in June 2025.¹⁹ Costs are higher in big cities such as New York and Los Angeles. If cost is a worry, ask about payment plans, low-cost clinics, veterinary schools and charity funds.^18,20

Constipation or Blockage?

A constipated dog strains to pass small, hard, dry stools but is usually otherwise bright and eating.²¹ A dog with a blockage is more likely to vomit, refuse food, seem painful and become lethargic.^3,2 Don't give laxatives or home remedies if a blockage is possible. Call your vet first. See dog constipation.

Preventing Blockages

• Keep socks, underwear, toys, corn cobs, bones and trash out of reach.^2,7
• Supervise chews and throw away toys and chews once they're small enough to swallow.^7,22
• Train "leave it" and "drop it," and consider basket muzzle training for dogs that scavenge on walks.^2,7

Frequently Asked Questions

Will a dog still poop with a blockage?

Sometimes. With a partial blockage, a dog may still pass stool or diarrhea, so pooping doesn't rule a blockage out.

Will a dog still eat with a blockage?

Most dogs lose their appetite, but some with a partial blockage still eat a little and then vomit.

How long can a dog survive with a bowel obstruction?

There's no safe waiting period. A complete blockage can damage the bowel quickly, so see a vet right away.

Can a blockage clear on its own?

Small, smooth objects sometimes pass, but only under a vet's monitoring. Strings and large objects usually need removal.

How soon will I know if my dog has a blockage?

Vomiting is usually the first sign. In one study, most dogs were diagnosed 12 to 24 hours after vomiting began.