Recognising Heatstroke in Dogs Early: Key Signs & Prevention

Every summer in the UK, hundreds of dogs require emergency veterinary care due to heatstroke, a serious but preventable condition caused by overheating in hot weather. Recognising heatstroke early and understanding the factors that cause it can save your dog's life.

Heatstroke happens when a dog’s body temperature rises dangerously high, overwhelming their ability to cool down naturally. Dogs cool themselves primarily by panting, drinking water, resting, and finding cooler spots. If any of these mechanisms are impaired or insufficient, heatstroke can develop rapidly.

What is heatstroke?

Heatstroke in dogs is a critical medical emergency resulting from prolonged exposure to high temperatures and insufficient cooling. When dogs cannot regulate their body temperature effectively, their organs can suffer damage, potentially leading to fatal outcomes. Common signs begin with mild overheating but can escalate quickly without timely intervention.

Factors that lead to heatstroke in dogs

While hot weather is a key driver of heatstroke, several contributing factors can increase risk. High temperatures during summer months combined with restricted airflow, limited water access, and excessive exertion heighten the danger.

Some situations that commonly lead to heatstroke include:

• Intense physical activity during the hottest parts of the day.
• Long walks or playtime under direct sun without shade.
• Being left in parked cars or other confined, heated spaces with poor ventilation.
• Restricted or infrequent access to fresh water.
• Inability to find shaded or breezy resting areas.

Brachycephalic breeds, such as the pug puppies or French bulldogs, face a higher risk due to their compressed airways, which limit efficient panting and cooling.

Recognising heatstroke in dogs early

By understanding early warning signs, you can act swiftly to prevent heatstroke progression. Key early symptoms include the following 17 signs:

• Excessive panting even at rest or difficulty breathing.
• Gasping for air, often tilting the head back.
• A tongue bright red or darker than usual.
• Disorientation or confusion.
• Dehydration indicated by skin elasticity check.
• Dizziness or imbalance.
• Dry, hot skin to the touch.
• Fainting or semi-consciousness.
• Weakness or shakiness when walking.
• Thick, gluey saliva.
• Bright red inner ear skin.
• Gums which can be very pale or unusually red.
• Vomiting and diarrhoea.
• Signs of distress and discomfort.
• Temperature exceeding 104°F (40°C).
• Faster than normal heart rate.

If you notice symptoms like bright red gums, rapid breathing, and disorientation, it is crucial to cool your dog immediately and seek veterinary help.

How to check dehydration and cool your dog

Perform a simple skin elasticity test to check hydration: pinch a loose patch of skin between thumb and forefinger. If skin snaps back immediately, your dog is well hydrated. If slow to return, dehydration is likely and dangerous in heatstroke.

To cool your dog in the earliest stages of heatstroke:

• Move them to a shaded, cool area away from direct sunlight.
• Apply cool damp towels to the body, especially paws, belly, and groin.
• Use fans or air conditioning to aid cooling.
• Allow small sips of cool water if they are alert and willing to drink.
• Avoid using ice-cold water or ice packs which may cause shock.

When does heatstroke require urgent veterinary care?

Heatstroke can become life-threatening quickly, causing damage to the brain, heart, lungs and kidneys. Immediate veterinary attention is required if:

• Your dog collapses, becomes unconscious or seizures.
• There is a rapid or irregular pulse.
• Excessive vomiting or diarrhoea develops.
• Signs of severe dehydration or shock appear.

Prompt intervention at the vet can be lifesaving and prevent long-term organ damage.

Preventing heatstroke: responsible dog ownership in hot weather

Preventative measures give your dog the best chance to stay safe, happy and comfortable in summer:

• Plan exercise for cooler parts of the day, such as early morning or late evening.
• Never leave your dog in parked vehicles, even with windows down.
• Provide constant access to fresh water outdoors, topping up frequently.
• Ensure access to shady, well-ventilated resting spots.
• Know your dog's breed risk factors and adjust activity accordingly.

By staying vigilant and proactive, you can enjoy the warm months with your dog without risking their health.