TL;DR: Electrical cord chewing is a life-threatening emergency that can cause severe mouth burns and delayed, fatal lung damage. Seek immediate veterinary care even if your dog appears normal, as symptoms may take several hours to develop.
What happens when a dog chews on an electrical cord?
Electrical cord chewing occurs when a dog gnaws through the protective insulation of a wire, causing their mouth to come into contact with live electricity. This can result in localized thermal burns to the tongue and gums, but more dangerously, it can cause systemic issues like fluid accumulation in the lungs (pulmonary edema) or disruptions to the heart's natural rhythm.
Is it an emergency if my dog chews on an electrical cord?
- Urgency Level: High. This is a critical medical emergency.
- Even if your dog appears normal immediately after the incident, the internal effects of an electric shock—specifically damage to the lungs—can take several hours to manifest.
- Electric shock can be fatal if left untreated; you should contact an emergency veterinarian immediately.
How does providing a photo help the veterinary triage process?
- A clear photo of your dog's mouth and gums allows a triage professional to identify early signs of tissue necrosis or charring.
- A photo of the damaged cord (taken only after the power source is safely disconnected) helps the veterinary team estimate the potential voltage exposure.
- These images allow the clinic to prepare the necessary oxygen or cardiac monitoring equipment before you even arrive.
Clinical Context (Merck Veterinary Manual)
Chewing on electrical cords is a common problem, especially in puppies. Systemic involvement, such as non-cardiogenic pulmonary edema, can be life-threatening and requires evaluation and treatment. Oral injuries frequently involve the tongue, lips, cheeks, labial and buccal mucosa, and palate, ranging from mild discomfort to tissue loss, scarring, and deformity. A linear scar across the dorsum of the tongue is often present, outlining the path of the cord. Lip commissures may have scars or wounds, and adjacent carnassial teeth may be discolored, potentially requiring endodontic treatment. Owners may observe the incident, but more commonly, it occurs in their absence. Affected animals may hesitate to eat or drink, drool, and resent handling.
Chapter: Dentistry
Source: The Merck Veterinary Manual, 11th Edition (Page 366)