Gastrointestinal foreign bodies in dogs and cats: symptoms and treatment

Summary

What is a gastrointestinal foreign body?

“Foreign body” is the veterinary term for swallowed material that should not be in the digestive tract. It may lodge in the oesophagus—the tube carrying food to the stomach—or in the stomach or intestines.

A blockage prevents food and fluid from moving normally. It can also damage the gut wall and its blood supply. If the wall tears, intestinal contents can leak into the abdomen, causing potentially life-threatening infection.

What objects cause problems in dogs and cats?

Dogs may swallow socks, underwear, toy pieces, balls, stones, bones, corn cobs and food packaging. Cats may swallow thread, wool, ribbon, hair ties, rubber bands and small toys.

Young, curious pets are particularly prone to swallowing inappropriate objects, although it can happen at any age. An object’s size, shape and material, together with the pet’s size, influence the risk.

Puppies and kittens are often adventurous and curious, and may end up hurting themselves whilst they are still growing. Their underdeveloped immune system means they are also vulnerable to getting infections and catching diseases.

Consider pet insurance to help protect you and your puppy from the start. Find out more about puppy insurance and kitten insurance.

Why is swallowed string especially dangerous?

String, ribbon, yarn and similar materials are called linear foreign bodies. They are particularly concerning in cats.

One end may become anchored under the tongue or elsewhere in the digestive tract. As the intestines move, they can bunch around the material, which may cut through the intestinal wall.

Never pull string or thread protruding from your pet’s mouth or anus. Seek urgent veterinary help.

What are the symptoms?

Signs depend on where the object is lodged and whether it causes a partial or complete blockage.

Stomach or intestinal foreign bodies

Possible signs include:

• Vomiting
• Reduced appetite or refusing food
• Abdominal pain or reluctance to be handled
• Lethargy or hiding
• Diarrhoea, sometimes containing blood
• Straining or passing smaller amounts of faeces
• Dehydration.

Cats may show subtle changes, such as becoming withdrawn or growling when picked up. These signs can also occur with other illnesses, so veterinary examination is important.

Objects lodged in the oesophagus

Signs may include excessive drooling, gagging, repeated swallowing, difficulty swallowing and regurgitation.

Regurgitation is the relatively passive return of food or fluid, usually without the abdominal effort associated with vomiting. An oesophageal foreign body requires prompt removal because it can damage the oesophagus and cause complications. 

What should I do if my pet swallows an object?

Call your vet or an emergency veterinary hospital immediately. Explain what was swallowed, approximately when it happened and any symptoms.

If available, bring an identical object, its packaging or a photograph to help the vet assess the risk.

Do not try to make your pet vomit at home or give treatments to force the object through. Ask the vet what to do about food and water while arranging assessment.

Repeated vomiting, severe pain, collapse or difficulty breathing require emergency care. A pet that initially appears comfortable may still need treatment.

How are gastrointestinal foreign bodies diagnosed?

Your vet will ask about possible access to swallowed objects and examine your pet. Tests may include:

• X-rays: To identify visible objects or changes suggesting an obstruction.
• Ultrasound: To assess the stomach, intestines and surrounding tissues.
• Blood tests: To check hydration, electrolyte levels and overall health.

Not every object is visible on an X-ray. Further imaging or exploratory surgery may be necessary when initial results are inconclusive but concern remains high.

How are swallowed foreign objects treated?

Treatment depends on the object, its location, your pet’s condition and any damage already present.

Veterinary monitoring

Selected small, smooth objects may pass safely. A vet may recommend close observation, fluids and repeat imaging to track progress. This requires a veterinary plan; it is not a reason to wait at home without advice.

Endoscopic removal

An endoscope is a flexible camera passed through the mouth under anaesthesia. It can sometimes be used to retrieve an object from the oesophagus or stomach, avoiding abdominal surgery.

Surgery

Surgery may be needed when an object causes an obstruction, does not progress, cannot be retrieved safely, or has damaged the gut. The surgeon removes the object and assesses the surrounding tissue. Severely damaged intestine may need to be removed and the healthy ends reconnected.

Supportive treatment can include intravenous fluids, pain relief, anti-nausea medication and antibiotics when indicated.

What happens during recovery?

Recovery depends on the procedure and your pet’s condition. Follow your vet’s instructions about feeding, medication, activity restrictions, wound protection and follow-up appointments.

After intestinal surgery, leakage from the surgical site is a serious possible complication, particularly during the first few days. Contact your vet urgently if your pet develops renewed vomiting, worsening lethargy, refusal to eat, abdominal swelling or discharge from the incision.

Many pets recover well with prompt treatment. The outlook is less favourable when there is extensive bowel damage, leakage or severe infection.

How can I reduce the risk?

• Store socks, underwear, rubbish and food packaging securely.
• Keep string, sewing supplies, ribbon, tinsel and hair ties away from cats.
• Choose appropriately sized toys and remove damaged ones.
• Supervise play and chewing.
• Teach dogs “leave it” and “drop it”.
• Discuss repeated scavenging or swallowing of non-food objects with your vet.

Preventing access to tempting objects is especially important for pets that have swallowed something before.

Acting early gives your pet the best chance

Swallowed objects can become serious before the full extent of the problem is obvious. If you suspect your dog or cat has swallowed something dangerous, contact your vet promptly rather than waiting for signs to develop.

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