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Radiographically Confirmed Oropharyngeal Bone Foreign Body in a Dog Managed by Transoral Extraction Under General Anesthesia

A dog was presented to Aycardo Veterinary Center Inc. (AVCI) following repeated episodes of vomiting or retching after chewing a bone. Diagnostic radiographs demonstrated a radiopaque foreign body lodged within the upper aerodigestive tract, consistent with an impacted bone.

Because the foreign material was accessible through the oral cavity, removal was performed under general anesthesia. Controlled transoral extraction allowed the bone to be removed without the need for an external surgical approach. A post-removal radiograph was subsequently obtained to confirm that the previously identified radiopaque foreign body was no longer present.

The patient recovered following successful removal.

Why a Lodged Bone Can Become a Medical Emergency

Bones are among the most frequently reported esophageal foreign bodies in dogs. In a retrospective series of 222 canine esophageal foreign-body cases, 81% involved osseous material, while another study involving 349 cases reported bones in 77.4% of patients.

Once a bone becomes lodged in the pharyngeal or esophageal region, the problem is no longer simply mechanical obstruction.

Persistent pressure from the foreign body against the mucosa can result in:

• mucosal abrasion and ulceration
• localized inflammation and esophagitis
• tissue ischemia and pressure necrosis
• hemorrhage
• perforation of the esophageal wall
• secondary infection
• aspiration-associated respiratory complications
• subsequent scar formation and esophageal stricture

Foreign bodies retained for longer periods are of particular concern. In one study of 114 dogs, foreign bodies present for more than 24 hours were significantly associated with more severe esophagitis and a greater incidence of major complications.

Esophageal perforation is one of the most serious complications because disruption of the esophageal wall can allow saliva, food material and bacteria to contaminate surrounding tissues. Studies of canine esophageal foreign bodies have also identified perforation and post-procedural hemorrhage as important factors associated with poorer outcomes.

For this reason, a suspected lodged bone should not simply be observed at home in the hope that it will eventually pass.

Not Every Swallowed Bone Behaves the Same Way

The anatomical location of the bone is important.

An esophageal bone foreign body generally requires intervention, because persistent impaction can damage the esophageal wall.

A bone that has already reached the stomach is a different clinical situation. In a study involving 129 dogs with esophageal or gastric bone foreign bodies, most esophageal bones required removal or advancement into the stomach, while many gastric bones were managed without removal and subsequently dissolved without reported complications.

This illustrates why veterinary assessment and diagnostic imaging are important. The presence of a swallowed bone does not automatically dictate the same treatment in every patient.

Location, size, shape, duration of impaction, clinical signs and evidence of tissue injury all influence management.

Why General Anesthesia Is Used for Removal

Removal of a firmly lodged oropharyngeal or esophageal foreign body requires controlled manipulation.

General anesthesia provides immobilization, jaw relaxation and better access to the oral cavity while allowing the veterinary team to secure and manage the airway during extraction.

Attempting to forcibly remove a deeply lodged bone from an awake or struggling animal may increase the potential for trauma, fragmentation of the foreign body, aspiration or injury to surrounding tissues.

Depending on its position, a foreign body may be removed transorally, endoscopically, advanced into the stomach, or—when minimally invasive removal is unsuccessful or perforation is suspected—managed surgically.

In this AVCI case, the bone was successfully extracted through the oral cavity under general anesthesia, avoiding the need for an external surgical approach.

AVCI’s Position on Bone Chewing: Risk Reduction, Not a Total Ban

AVCI does not advocate a blanket prohibition on all bone chewing.

Chewing is a normal canine behavior, and mechanical chewing can contribute to removal of dental deposits. Experimental studies involving bovine bones have demonstrated substantial reductions in supragingival dental calculus during short study periods.

However, these studies involved small numbers of controlled research dogs and relatively short observation periods. They should not be interpreted as evidence that bone chewing is free of risk.

The objective should therefore be safer chewing, not unrestricted access to bones.

There Is No Completely “Safe Bone”

Rather than maintaining a list of bones that are automatically permitted or prohibited, AVCI recommends evaluating the physical characteristics of the chew and the behavior of the individual dog.

A practical safe-chewing approach should consider the following:

1. Avoid bones that can be swallowed whole

A bone or remaining fragment should not be small enough for the dog to gulp down intact.

Dogs that attempt to swallow objects rather than gradually gnaw them are poor candidates for recreational bone chewing.

Once a previously large bone has been reduced to a swallowable size, it should be removed.

2. Avoid excessively hard chewing objects

Very dense materials can subject the premolars and molars to substantial mechanical forces.

Experimental testing of canine maxillary fourth premolar teeth has demonstrated that fracture can occur under forces within the chewing capability of domestic dogs. Very hard objects that fail to yield during mastication may therefore increase the risk of crown or crown-root fracture.

Dense cortical bone is substantially stronger under compression than porous or spongy bone. One mechanical study reported compressive strength of approximately 111 MPa for cortical bone compared with approximately 10 MPa for spongy bone.

For this reason, hardness matters as much as size.

3. Prevent access to sharp or fractured pieces

Bone fragments with pointed or irregular edges can injure the gingiva, oral mucosa, pharynx, esophagus or gastrointestinal tract.

Inspect the chewing item regularly and remove it when it begins breaking into sharp or easily swallowed fragments.

4. Chewing should always be supervised

Bone chewing should not mean giving a dog a bone and leaving the animal unattended for several hours.

Observe how the dog uses it.

A patient that methodically gnaws is very different from a dog that aggressively crushes and attempts to swallow large pieces.

The individual dog’s chewing behavior is therefore part of the risk assessment.

5. Bone size must be matched to the dog

The same bone cannot reasonably be considered appropriate for a Chihuahua and a German Shepherd.

The chewing item must be selected according to the patient’s jaw size, body size, chewing strength and tendency to ingest foreign material.

6. Raw bones introduce an additional microbiological consideration

Raw animal products can carry zoonotic organisms.

Studies evaluating commercial raw meat diets have identified contamination with organisms including Salmonella and Escherichia coli, and dogs consuming raw diets may also shed these organisms in their feces.

This is particularly relevant in households containing young children, elderly individuals, pregnant women, immunocompromised individuals or others at increased risk from foodborne pathogens.

Safe handling, hand hygiene, surface disinfection and appropriate storage therefore remain important whenever raw animal products are provided.

Bone Chewing Is Not a Substitute for Dental Care

Another important distinction is that mechanical removal of visible calculus does not necessarily mean that periodontal disease has been prevented.

Bone chewing may mechanically reduce supragingival deposits, and controlled studies have demonstrated substantial reductions in visible calculus.

However, periodontal disease involves structures below the gumline as well as the visible tooth surface.

Bone chewing should therefore not replace veterinary oral examination, dental radiography when indicated, or professional dental prophylaxis.

It should be viewed only as one possible component of oral enrichment and mechanical chewing.

Recognizing a Possible Lodged Bone

Pet owners should seek veterinary attention if a dog develops sudden signs after chewing a bone, particularly:

• repeated gagging or retching
• repeated swallowing movements
• hypersalivation
• difficulty swallowing
• regurgitation or vomiting-like episodes
• pawing at the mouth
• refusal to eat
• signs of pain when swallowing
• coughing or respiratory difficulty

These signs can also occur with other upper gastrointestinal or respiratory conditions, so diagnostic examination is necessary to determine the cause.

The Take-Home Message

Bones are not automatically harmless simply because dogs naturally enjoy chewing them—but neither does responsible veterinary guidance have to mean prohibiting every form of bone chewing.

AVCI supports safe chewing rather than unsupervised chewing.

The goal is to reduce preventable risks through appropriate selection, adequate size, consideration of hardness, direct supervision, removal of damaged or swallowable fragments, and recognition of dogs whose chewing behavior makes bone consumption unsafe.

Most importantly, when a dog suddenly develops gagging, repeated retching, difficulty swallowing or persistent vomiting-like episodes after chewing a bone, do not assume that the material will simply pass.

A lodged bone can progress from a foreign-body obstruction to significant tissue injury.

Early examination and diagnostic imaging can make the difference between a foreign body that can be removed relatively straightforwardly and one complicated by severe inflammation, perforation or the need for more invasive treatment.