What are the signs my dog or cat has a blockage?

Repeated vomiting (often unable to keep food or water down), loss of appetite, lethargy, abdominal pain, and sometimes straining with little or no stool. A complete obstruction is an emergency, so if a pet that may have swallowed something is vomiting repeatedly, see a vet promptly.

Why are string and thread so dangerous for cats?

A linear foreign body like string often anchors at one end, commonly under the tongue or in the stomach, while the rest travels on. The intestine then bunches up along it and the string can saw through the bowel wall. This is more dangerous than a solid object and usually needs surgery.

What should I do if I see string hanging from my cat's mouth or rear?

Do not pull it. If the string is anchored inside, pulling can cut or perforate the intestine. Leave it alone and get to a vet immediately.

How is a swallowed object treated?

It depends on what and where. Some objects sitting in the stomach can be retrieved with an endoscope or by inducing vomiting if it was very recent and appropriate. A true obstruction in the intestine almost always needs surgery to remove it, and damaged bowel may need to be removed too.

How much does foreign body surgery cost for a pet?

Commonly around $2,000 to $8,000 or more, higher at emergency and specialty hospitals or if the bowel has been damaged and needs resection, plus imaging and hospitalization. These are US market estimates that vary widely by region and severity.

“My Pet Swallowed Something”: Gut Obstruction in Dogs and Cats

Here is the short version: pets swallow things they should not, and when an object gets stuck in the stomach or intestine, it becomes an emergency that can kill if it is missed. Dogs tend to swallow solid objects, socks, toys, bones, corn cobs, while cats are drawn to string and thread, which are deceptively the most dangerous of all. This guide covers the warning signs, why a swallowed string is a special kind of emergency, how vets treat it, and the single thing you should never do if you find string on your cat.

What pets swallow, and which is worse

Gastrointestinal obstruction from a swallowed object is a common emergency in both dogs and cats.¹ Dogs are the classic offenders with solid items, toys, socks and clothing, rocks, bones, and corn cobs.³ Cats more often swallow linear foreign bodies, the string, yarn, thread, and dental floss they were playing with, and that distinction matters enormously, because linear objects are far more dangerous than a single solid one.¹

Why string is the dangerous one

A linear foreign body behaves in a uniquely destructive way. One end tends to anchor in place, commonly at the base of the tongue or in the stomach, while the intestine keeps trying to push the rest along. The bowel "plicates," or bunches up like fabric gathered on a thread, and the taut string can saw through the intestinal wall, which carries a high risk of perforation.¹⁴ That is why a vet examining a vomiting cat will look under its tongue for a loop of thread.¹

This leads to the most important do-not in this entire article. If you ever see string hanging from your cat's mouth or backside, do not pull it. If the other end is anchored or embedded inside, pulling can slice or perforate the gut. Leave it exactly as it is and get to a vet immediately.¹

The warning signs

An obstruction tends to announce itself through the gut:¹²

Vomiting, often repeated, and an inability to keep food or water down.
Loss of appetite and lethargy.
Abdominal pain, a tense or guarded belly.
Reduced or absent stool with a complete blockage.

A complete obstruction is a true emergency.¹ Because vomiting has many causes, our guide on dog vomiting and diarrhea can help you judge severity, but a known or suspected swallowed object plus repeated vomiting is a go-to-the-vet situation on its own.

What can go wrong if it waits

The danger is not just the blockage, it is what follows. A trapped object cuts off blood supply and can cause the bowel to die, and a perforation spills gut contents into the abdomen, causing peritonitis, a life-threatening infection.² This is why obstructions are handled as emergencies rather than wait-and-see.

How it is diagnosed and treated

Diagnosis combines a physical exam with imaging. X-rays catch many objects, but some, like cloth or rubber, are hard to see, so vets add contrast studies or ultrasound when the picture is unclear.¹ Treatment depends on what and where. An object sitting in the stomach can sometimes be retrieved with an endoscope, or by inducing vomiting if the ingestion was very recent and the object is appropriate.² A true intestinal obstruction almost always needs surgery to remove the object, and any bowel that has been damaged is removed at the same time.²

What it costs

Foreign-body surgery is major. Costs commonly run from about $2,000 to $8,000 or more, climbing at emergency and specialty hospitals and when the bowel must be resected, with imaging and hospitalization on top. These are US market estimates that vary by region and severity. As with the other emergencies on this site, prevention is far cheaper than the operation.

What to do this week

Keep swallowable objects, socks, kids' toys, hair ties, corn cobs in the trash, out of reach, and supervise chew toys.
For cats, treat string, yarn, ribbon, tinsel, and dental floss as hazards, not toys, and store them shut away.
Learn the one rule that saves lives: never pull a string you see on a cat. Go to the vet.
If your pet swallowed something and starts vomiting repeatedly or stops eating, call an emergency vet rather than waiting overnight.

Curiosity and a fast set of jaws are a risky combination, and most owners of swallow-everything pets will face this scare at some point. The pets that do best are the ones whose owners act quickly on the warning signs and know the string rule. Keep the tempting objects away, watch for the vomiting that will not quit, and when in doubt, let the vet take a look.