Could My Dog Have Intussusception?

If your dog is vomiting repeatedly, passing bloody stool, and seems like they’re in real pain, you’re right to be worried. One possibility your vet will want to rule out is intussusception, a condition where one part of the intestine slides inside another, like a telescope collapsing into itself. It cuts off blood flow and blocks everything moving through the gut. And it’s a surgical emergency.

The good news: dogs that get to surgery quickly often recover well. Timing is everything here, which is why knowing what to watch for matters so much.

What is intussusception in dogs?

Your dog’s intestines are a long, continuous tube. Normally, food and fluid move through in one direction, propelled by rhythmic muscle contractions. With intussusception, one segment of that tube slides into the segment next to it, like a sock folding in on itself. The result is a partial or complete bowel obstruction: nothing can get through, blood supply to the affected tissue gets cut off, and things deteriorate quickly.

The most common site is the ileocolic junction, where the small intestine meets the large intestine. But intussusception can happen anywhere along the digestive tract. It’s seen in dogs of any age, but puppies under three months old are at significantly higher risk, partly because their intestines are still developing and partly because they’re more likely to pick up the infections and parasites that trigger it.

Signs of intussusception in dogs

The symptoms tend to come on fast and get worse quickly. Here’s what you might notice:

• Vomiting, often repeated and sometimes projectile: One episode is concerning. Multiple rounds in quick succession, especially combined with any other symptom below, is an emergency.
• Bloody stool or mucus-heavy diarrhea: Any blood in stool alongside vomiting means get to a vet now, not in the morning.
• Abdominal pain: Your dog may hunch their back, resist being touched near the belly, or cry out. Visible pain is always a reason to act quickly.
• Lethargy and sudden loss of interest in food or water: A dog that was fine a few hours ago and is now completely uninterested in everything is telling you something is wrong.
• Straining to defecate without producing much: The obstruction makes passing stool difficult or impossible, even when your dog is clearly trying.
• A visibly distended or tender abdomen: If the belly looks swollen or feels tight, that’s a prompt for urgent care.
• Weakness or collapse: A sign the condition has progressed significantly. Go to emergency care immediately.
• Tissue protruding from the rectum: This looks alarming because it is. Go to a vet immediately.

In some cases, part of the intestine may actually protrude from the rectum, which looks alarming and means you need to get to a vet immediately.

Spotting the emergency: GI signs that mean go to the vet now

Not every upset stomach is a crisis. But with intussusception, waiting to see if things improve can cost your dog their life. Here’s a straightforward guide to help you decide.

Rush to an emergency vet immediately if your dog has:

• Bloody stool combined with vomiting
• Vomiting that won’t stop, especially if it’s been more than two or three rounds
• A visibly swollen, hard, or painful belly
• Sudden, extreme lethargy or collapse
• Any tissue protruding from the rectum
• Signs of severe pain: crying, hunching, or inability to get comfortable

Call your vet within hours (don’t wait until morning) if your dog has:

• One episode of vomiting plus loose stool but is still alert
• Mild lethargy with reduced appetite but no other symptoms
• Soft stool with a small amount of blood or mucus

The rule of thumb: if symptoms involve both ends (vomiting and abnormal stool) at the same time, don’t wait. That combination points to something systemic and potentially serious. Intussusception can progress from manageable to life-threatening within hours.

What causes intussusception in dogs

Intussusception usually happens when something disrupts the normal rhythm of the intestines. Common triggers include:

• Intestinal parasites like roundworms or hookworms, especially common in puppies
• Parvovirus, a serious viral infection that causes severe GI inflammation
• Foreign body ingestion, where a swallowed object irritates or lodges in the intestine
• Sudden diet changes that upset the gut
• Intestinal infections, bacterial or viral
• Tumors or polyps in older dogs that alter how the intestine moves

In puppies, parasites and parvovirus are the most frequent culprits. In adult dogs, foreign bodies and underlying GI disease are more commonly involved.

Diagnosis and treatment

How vets diagnose intussusception

Your vet will start with a physical exam, feeling along the abdomen for a firm, sausage-shaped mass, which is sometimes palpable with intussusception. From there, they’ll likely use:

• Ultrasound: the gold standard for diagnosing intussusception. It shows the characteristic “target sign,” which is what a telescoped section of intestine looks like when scanned. It’s non-invasive and fast.
• X-rays: can show signs of bowel obstruction or gas buildup, though less definitive than ultrasound on their own
• Bloodwork: to assess how the dog is handling the stress on their body and check for infection or dehydration

Surgery and what to expect

Treatment is surgical. The surgeon will attempt to manually reduce the intussusception by gently separating the telescoped sections. If the trapped tissue has lost its blood supply and is no longer viable, that portion of the intestine may need to be removed and the healthy ends rejoined, a procedure called resection and anastomosis.

To reduce the risk of recurrence, the surgeon may also perform enteroplication, where sections of the intestine are carefully sutured together in a way that prevents them from telescoping in the future. It’s a standard part of managing this condition in high-risk cases.

Survival rate and recovery

Survival rates are encouraging when surgery happens quickly and the intestinal tissue is still healthy. Dogs that make it through surgery and the immediate post-op period generally do well. Recovery involves a hospital stay of a few days, a restricted diet while the gut heals, and follow-up care to treat whatever underlying condition triggered it. Recurrence is a real risk, which is why enteroplication is often recommended.

Does pet insurance cover intussusception in dogs?

Emergency surgery for intussusception isn’t cheap. Between the ultrasound, the procedure itself, anesthesia, hospitalization, and post-op care, costs can range from $2,000 to $8,000 or more depending on complexity and where you live. If resection is needed, it’s often toward the higher end.

If your dog develops intussusception after your Lemonade Pet policy is active, a base accident and illness policy can help cover eligible costs including emergency imaging, surgery, and hospitalization, as long as the condition isn’t pre-existing and develops after the 14-day illness waiting period has passed.

Before we go

Intussusception is one of those conditions where knowing what to look for can genuinely save your dog’s life. If you’re seeing vomiting, bloody stool, abdominal pain, or sudden lethargy, especially in a puppy, don’t wait it out. Get to a vet fast. Dogs that get to surgery in time have real reason for optimism. And if you don’t yet have pet insurance, now’s the time to look into it. An emergency like this is exactly what coverage exists for, but it has to be in place before anything goes wrong.

Frequently Asked Questions

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.