Heat Stroke Awareness is Necessary as Summer Approaches
As the Australian summer reaches its peak, veterinary clinics across the country brace for one of the most preventable yet serious emergencies: heat stroke. While pet owners may be aware of the risks for themselves, animals can be very vulnerable to high temperatures, and the consequences of hyperthermia can be rapid and devastating. For veterinarians and veterinary nurses, early recognition, swift intervention and treatment and effective client education remain the cornerstones of managing this seasonal threat.
Heat stroke, also known as non-pyrogenic hyperthermia, occurs when heat gain exceeds an animal’s ability to dissipate it, causing core body temperatures to rise dangerously. Unlike humans, who rely heavily on sweat, dogs and cats primarily cool themselves through panting and a limited number of sweat glands located in their paw pads. When ambient temperature or humidity overwhelms these mechanisms, internal organs can overheat, leading to multi-organ dysfunction and, in severe cases, death. Australian veterinary data suggest that nearly four in ten dogs affected by severe heat stroke do not survive, underscoring the urgency for prompt clinical intervention. A study by the Royal Veterinary College highlights that once a dog’s core temperature exceeds 41°C, the risk of organ failure escalates sharply.
The Australian climate amplifies the risk of heat stroke. High temperatures combined with coastal humidity or inland dryness create conditions that are challenging for thermoregulation. Even moderate heat can be dangerous if animals are confined to small, poorly ventilated spaces or if there is a lack access to shade and water. Brachycephalic breeds are particularly susceptible to heat stress due to their airway anatomy, that limits both effective airflow and heat dissipation.
While dogs are the most frequently affected species, heat stroke can impact cats, small mammals, birds, and livestock. Cats, particularly long-haired or overweight individuals, may suffer if confined indoors without adequate cooling. Rabbits, guinea pigs, ferrets, and birds are extremely sensitive to heat due to high metabolic rates and limited thermoregulatory capacity. Poorly ventilated hutches or cages in direct sunlight can rapidly overheat.
Recognising Heat Stress
Recognising heat stress early can make the difference between a negative or positive outcome for the patient. Initial clinical signs may be subtle, including increased panting, hypersalivation, restlessness, and seeking cooler surfaces. As temperatures rise further, affected animals may become dyspnoeic, with progressive tachypnoea, excessive respiratory noise and effort, show GIT signs, progressive ataxia and neurological signs that may lead to collapse and seizuring.
Emergency management is centred on halting further heat gain and core temperature elevation. Pre-hospital first aid involves moving the animal to a shaded or air-conditioned environment, applying cool water to ventral surfaces, and promoting evaporative cooling with fans. Owners should be cautioned against iced water immersion, which may induce peripheral vasoconstriction and is risky with patients displaying altered consciousness. Veterinary intervention involves active cooling until core temperature stabilises and is focused on supporting systemic perfusion and oxygenation. Fundamentals of treatment include administration of intravenous fluid therapy to support circulatory function and perfusion, respiratory support and monitoring, including oxygen supplementation and sedation if needed. Brachycephalic breeds and animals showing signs of upper respiratory tract obstruction may require interventions, such as emergency intubation or temporary tracheostomy.
Monitoring of blood gas parameters, serial chemistry, for renal and hepatic assessment and coagulation parameters are fundamental to managing hyperthermia. Laboratory findings in severe cases can include profound metabolic acidosis, azotaemia, elevated liver enzymes, and thrombocytopaenia, all of which guide prognosis and treatment strategies. Delayed organ injury can occur in the 48–72 hours following profound heat stress events.
When it comes to Heat Stroke prevention is key
Prevention remains the most effective approach. Veterinary teams play a vital role in educating the pet-owning community, particularly owners of high-risk animals. Advising avoidance of exercise in peak heat; ensuring constant access to water and shade and not leaving animals in vehicles are simple steps. Relocating small animals indoors during heatwaves can help prevent heat stroke cases. For veterinary clinics, preparing pre-summer emergency kits and refreshing staff training in triage, cooling protocols, and client education can help improve outcomes.
Heat stroke is a preventable but high-stakes emergency. With hotter and longer summers, veterinary teams must combine clinical vigilance, structured emergency protocols, and proactive client education to reduce morbidity and mortality. Rapid recognition, timely cooling, and supportive care save lives, while prevention through awareness and planning remains the ultimate safeguard.
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References:
- Vet Practice Magazine (2021). Heat stroke in dogs: causes, treatment and prevention.
- RSPCA Australia (2025). Protecting companion animals from heat stress.
- Royal Veterinary College (UK). Heatstroke in dogs and cats.
- VetAPedia. Heatstroke Protocols – Common Protocols. Available at: https://vetapedia.com.au/courses/common-protocols/lessons/heatstroke (accessed 12 November 2025).
- Lozada Miranda B. Stabilizing Dogs With Upper Airway Obstruction & Heat Stroke. Clinician’s Brief (2024). Clinical Skills, Emergency Medicine & Critical Care. Available at: https://www.cliniciansbrief.com