Snake Bite Envenomation in Dogs and Cats

1 Symptoms

Venom enters through the bite and spreads in blood or lymph. It is a complex mix, broadly classed as neurotoxic, hemotoxic, or both.

Neurotoxic venom blocks nerve signaling, causing skeletal-muscle paralysis and even respiratory-center failure. Hemotoxic venom directly damages the heart (leading to heart failure), breaks down red cells and vessel walls (causing bleeding and tissue death), and lowers blood pressure.

Neurotoxic bites may show little local change but cause drooling, vomiting, hoarse voice, locked jaw, trouble swallowing, rapid breathing, weakness, wobbly gait, tremors, then coma and death from heart and breathing failure. Hemotoxic bites show red, hot, painful swelling, bleeding from the bite, and whole-body signs such as vomiting, diarrhea, bleeding from gums or skin, reduced urine, and shock.

Venomous bites leave paired puncture marks.

2 Causes and Transmission

A bite from a venomous snake (for example a viper or an elapid such as a cobra) that injects venom while the pet investigates or is bitten.

3 Diagnosis

The veterinarian confirms envenomation from the history, paired fang marks, and progressive paralysis or bleeding, and assesses heart and breathing. Specific venom identification guides antivenom choice.

4 Treatment

Principle: stop venom spread, remove and neutralize toxin, and treat signs.

First aid: a pressure bandage above the bite (without cutting off breathing) and cleaning the wound. Veterinary care includes antivenom, anti-inflammatory medication, fluids, and support of heart and breathing. Severe cases may need oxygen and emergency drugs.

5 Prevention

Keep pets on leashes in snake habitat, especially in warm months; clear brush where snakes hide.

Seek emergency care at once after any suspected snake bite — do not wait for signs.