Intestinal Perforation

Gastrointestinal (GI) foreign bodies occur when pets ingest objects that cannot be digested and are unable to pass normally through the stomach or intestines. These objects may include toys (Figure 1), leashes, clothing, sticks, or any other items that fail to move through the digestive tract, including human food-related materials such as bones or garbage. When such items become stuck within the GI tract, they can lead to significant illness.

The severity and nature of the problems depend on:

• the length of time the foreign object has been present,
• the exact location within the gastrointestinal tract,
• the extent to which the object obstructs the GI passage, and
• the material composition of the object. Certain ingested materials, such as older pennies or lead-containing items, may cause systemic toxicity, while others can result in localized intestinal injury due to pressure or blockage.

Gastrointestinal foreign bodies, particularly linear objects like string, may cause tearing or perforation of the intestinal wall. This allows intestinal contents to leak into the abdominal cavity, rapidly resulting in a life-threatening inflammation of the abdominal lining (peritonitis) and promoting bacterial spread and infection (sepsis). Although some small foreign objects may pass on their own, many become lodged somewhere along the GI tract, leading to pain and illness. Some foreign bodies located in the stomach can be removed using an endoscope; however, the majority require surgical exploration of the abdomen for removal. In certain cases, foreign objects may become lodged in the esophagus near the heart base or diaphragm, necessitating thoracic (chest) surgery.

Clinical signs vary widely depending on the degree of obstruction, the location, the duration, and the type of foreign body involved. Frequently observed signs include:

• vomiting
• anorexia (decreased or absent appetite)
• abdominal pain
• dehydration
• diarrhea, with or without blood
• accumulation of abdominal fluid

In cases involving linear foreign bodies, a string may be visible wrapped around the base of the tongue (Figure 1) or protruding from the anus.

Foreign bodies or intestinal blockages can lead to dehydration and electrolyte disturbances, causing systemic illness. If the foreign object perforates the gastrointestinal tract and enters the chest or abdominal cavity, the animal may become critically ill. Such complications can result in peritonitis, sepsis, and potentially death.

Your primary care veterinarian will typically recommend initial laboratory testing, including a complete blood count (CBC), serum chemistry panel, and urinalysis. These tests help exclude other potential causes of your pet’s clinical signs. Abdominal radiographs, and occasionally thoracic radiographs, are commonly performed (Figures 2 and 3). When standard radiographs do not reveal the cause, contrast radiographs using barium may be used to outline the stomach and intestines. Abdominal ultrasound is often very useful for detecting gastrointestinal foreign bodies. In certain situations, advanced imaging such as computed tomography (CT) may be required.

Not all gastrointestinal foreign bodies require surgical intervention. In some cases, the ingested object is sufficiently small and smooth to pass through the digestive tract without causing injury or obstruction. In these situations, your veterinarian may recommend hospitalization with intravenous fluid therapy and close monitoring to assist passage of the object. Some foreign bodies located in the upper gastrointestinal tract (mouth, esophagus, or stomach) may be removed by inducing vomiting or through the use of a flexible endoscope.

If conservative treatment and endoscopic retrieval are unsuccessful, if radiographs show no movement of the object, if the obstruction worsens, or if a linear foreign body is suspected, surgical exploration becomes necessary.

Foreign bodies lodged in the esophagus require thoracic surgery for removal. Most GI foreign bodies are found in the stomach or intestines and require either a gastrotomy (surgical opening of the stomach) or an enterotomy (surgical opening of the intestine). After removal, the gastrointestinal tract is closed. If a section of intestine is severely damaged, it is surgically removed and the healthy ends are reconnected (intestinal resection and anastomosis). The surgeon determines the appropriate procedure after evaluating the intestines and abdominal organs, often making the final decision during surgery once the extent of tissue damage can be directly assessed.

Following abdominal surgery, animals receive intravenous fluids and have their vital signs closely monitored for 12–24 hours. In some cases, a small tube may be inserted through a nostril into the stomach to help remove accumulated fluid and gas. Animals with significant intestinal injury may require intravenous antibiotics. Food is offered once the pet begins to recover, as early reintroduction of oral nutrition is important for intestinal healing. Electrolytes and other blood parameters may be checked periodically during recovery. Once pets are eating independently and can tolerate oral medications, they may be discharged from the hospital.

Possible complications of intestinal surgery include decreased gastrointestinal motility (ileus), narrowing at the surgical site (stenosis or stricture formation), short bowel syndrome, or leakage of intestinal contents into the abdomen. The most serious complication is intestinal leakage, which can result from poor healing, tissue damage, or failure of suture material. Leakage most commonly occurs within the first five days after surgery. Clinical signs may include lethargy, worsening appetite loss, vomiting, fever, discharge from the surgical incision, or abdominal distension. If any of these signs occur after GI surgery, immediate veterinary reassessment is required. Animals experiencing leakage often need additional surgery and prolonged hospitalization.

Animals that undergo removal of large portions of the intestine (greater than 75%) are at risk of developing short bowel syndrome. Extensive intestinal loss reduces the surface area available for digestion and absorption, leading to maldigestion and malabsorption. This condition commonly results in persistent watery or greasy diarrhea and weight loss. Treatment options are available, and some animals may adapt over time, but close veterinary supervision is essential to ensure adequate nutrition.

Overall, the prognosis following gastrointestinal foreign body surgery is generally favorable. Preventing further ingestion of foreign objects is critical, as repeated abdominal surgeries carry increased risk due to the formation of adhesions. Keeping pets confined to environments free of ingestible objects when unsupervised can help reduce risk. Animals with recurrent foreign body ingestion may require the use of a basket muzzle to prevent future episodes.