Snake Bite. Every Second Counts.
Authored by Dr. Mark Tonzing & Dr. Romilly Haslam
Australia is home to the most venomous snakes in the world. In the leafy suburbs of Brisbane, interactions between curious pets and lethal wildlife are an all-too-common reality.
Snake envenomation is a time-critical, life-threatening emergency. The venom of Australian Elapids travels rapidly through the lymphatic system, launching a devastating attack on the nervous system, muscles, and blood clotting cascades.
This guide provides crucial first-aid steps for local pet owners and a useful clinical reference protocol.
The Bardon & Mt Coot-tha Corridor
Properties backing onto Mt Coot-tha, Ithaca Creek, and the leafy gullies of Bardon and Ashgrove provide perfect habitats for rodents and frogs—the primary food source for local snakes. During the warmer months (September to April), snake activity peaks.
While we frequently see non-venomous Carpet Pythons and Common Tree Snakes, the primary lethal threats in our geographical area are the Eastern Brown, the Red-bellied Black snake, and occasionally Whip snakes.
Eastern Brown (Pseudonaja textilis)
Highly aggressive when cornered. Venom is a profound procoagulant that causes a consumptive coagulopathy (rapid clotting that uses up platelets) resulting in uncontrollable bleeding, and a potent neurotoxin. Often found in dry bushland, rock retaining walls, and suburban gardens.
Red-bellied Black (Pseudechis porphyriacus)
Generally shyer, prefers damp areas near creeks and drainage lines. Venom is highly myotoxic (destroys muscle tissue), causing severe pain, muscle breakdown, and dark/red urine, alongside mild neurotoxicity.
Whip Snakes (Demansia spp.)
While systemically less toxic, they cause severe localized swelling and total limb paralysis—especially dangerous for cats. Note: There is no antivenom available for whip snakes; recovery requires intensive 24-hour supportive care.
For Pet Owners: Spotting the Signs
Unlike tick paralysis, which takes days to develop, snake bite symptoms often occur within minutes—but can take up to 24 hours to appear. Do not wait to find a bite mark, as they are often invisible under fur.
The "Collapse & Recover"
This is the hallmark sign of a Brown Snake bite. Your dog may suddenly collapse, vomit, or empty their bowels, and then appear to completely recover 10-15 minutes later.
This temporary recovery is deceptive. The lethal venom is still circulating, and they will rapidly crash again. Get to the vet immediately.
Other Critical Signs
- Dilated, large pupils that don't shrink in light
- Muscle tremors, shaking, or reduced eye blinking
- Wobbly gait, hind leg weakness, or total paralysis
- Unexplained bleeding from the mouth or dark, blood-tinged urine
First Aid: Rules of Survival
- Keep them STRICTLY still. Venom travels through the lymphatic system. Movement pumps the venom faster. Carry your pet to the car; do not let them walk.
- Apply a Firm Bandage (NO Tourniquets). If you know exactly where the bite is, apply a firm pressure bandage over, above, and below the site to slow lymphatic spread. However, do not apply a tight tourniquet that cuts off blood flow, as this causes tissue death.
- Call ahead. Let us know you are coming so we can prepare the oxygen, IV lines, and antivenom.
Veterinary Protocol: Australian Elapids
1. Local Toxidromes & Pathophysiology
Brown Snake (Pseudonaja spp.)
- Coagulopathy (VICC): Venom contains a prothrombin activator causing Venom-Induced Consumptive Coagulopathy. Rapid depletion of fibrinogen leads to spontaneous hemorrhage.
- Neurotoxicity: Pre-synaptic neurotoxins. Causes ascending flaccid motor paralysis. May be irreversible once bound to motor endplate (takes weeks to regenerate).
- Clinical picture: Pre-paralytic collapse, tachycardia, hematemesis, prolonged bleeding from venipuncture, progressive lower motor neuron paresis.
Black Snake (Pseudechis spp.)
- Myotoxicity: Severe rhabdomyolysis causing extreme somatic pain.
- Systemic: Hemolysis and marked pigmenturia (myoglobinuria/hemoglobinuria), risking secondary acute kidney injury (AKI).
- Coagulopathy: Mild, usually incomplete compared to Browns.
- Clinical picture: Painful swollen bite site (unlike Browns), dark red/brown urine, reluctance to move due to muscle pain, variable neurotoxicity.
2. Rapid Diagnostics
WBCT (Clotting Time)
Place 1-2ml of whole blood in a plain glass (red top) tube. Do not agitate. Check at 20 minutes. If unclotted = VICC (highly indicative of Brown/Tiger envenomation). Normal is <5 mins.
SVDK (Venom Detection)
Whilst snake Venom Detection Kits are available, a polyvalent snake antivenom (effective against multiple snake venoms) is often used in lieu of testing as it allows treatment to commence more quickly with a lower overall cost.
Biochemistry & UA
Expect massive CK (Creatine Kinase) elevations with Black/Tiger snakes. Monitor renal parameters. Free catch urine to check for pigmenturia.
3. Treatment & Antivenom Protocol
A. Pre-medication (Anaphylaxis Prophylaxis)
Antivenom is a hyperimmune equine serum; anaphylactic reactions are common. Pre-medicate with antihistamine and IV Corticosteroids (e.g., dexamethasone). Subcutaneous adrenaline may be pre-drawn and kept on standby.
B. Antivenom Administration
Where clinical signs are supportive of snake bite Tiger-Brown Bivalent is standard in SEQ, as Tiger antivenom cross-reacts with Black snake venom (there is no "Black snake" specific antivenom).
- Dilute 1 vial in 100ml to 250ml of 0.9% NaCl.
- Administer IV slowly over 30-45 minutes via infusion pump.
- Monitor continuously for urticaria, facial edema, tachycardia, or hypotensive shock. Stop infusion and administer IV adrenaline if severe anaphylaxis occurs.
C. Supportive Care & Coagulation
Aggressive IV fluid therapy (crystalloids) is critical, especially to flush kidneys if myoglobinuria is present. Once antivenom is administered, the liver rapidly synthesizes new clotting factors; however, if catastrophic bleeding is occurring, Fresh Frozen Plasma (FFP) or Whole Blood Transfusion may be indicated after antivenom neutralization.
Frequently Asked Questions
Can a dog or cat survive a snake bite without antivenom?
Generally, no. While a "dry bite" (where the snake strikes but injects no venom) can occasionally happen, a true envenomation from an Eastern Brown or Red-bellied Black snake is almost universally fatal without the administration of veterinary antivenom.
Are Carpet Pythons dangerous to pets?
Carpet pythons are common in Brisbane and are non-venomous. They pose a threat by constriction to very small pets (like guinea pigs, kittens, or small chihuahuas), but a bite to a medium or large dog will only cause mechanical tissue damage and a risk of infection, not systemic poisoning. However, if you cannot positively identify the snake, always assume it is venomous and seek immediate veterinary care.
Why is snake bite treatment so expensive?
Snake antivenom is highly specialized. It is produced by immunizing horses over many months and purifying their hyperimmune serum. A single vial can cost hundreds to over a thousand dollars to procure. Combined with the intensive, round-the-clock critical care, oxygen therapy, and IV fluid support required to keep the pet alive, treatment costs are significant. This is why pet insurance is highly recommended in Australia.
Should I kill the snake and bring it in?
Absolutely not. All native snakes are protected by law in Queensland. Furthermore, the vast majority of human snake bites occur when untrained people attempt to kill or capture a snake. If it is safe to do so, take a photo from a safe distance. Our polyvalent antivenom can be used without needing to formally identify the snake.
En route to the Clinic?
Snake bites are a Code Red Emergency. Please call ahead while in transit so our critical care team can prepare antivenom and life-saving equipment before you arrive. Keep your pet perfectly still.