Dog owners across the UK are being urged to rethink their walking routines after experts warned that the risk of heatstroke begins at temperatures as low as 20C, far below the extreme heat many associate with danger. The warning follows a 38C heatwave that prompted a rare red extreme heat warning from the Met Office, school closures, and transport disruptions.
Safe Temperature Range for Dogs
According to new guidance from Animal Friends Pet Insurance, temperatures between 7C and 15C are generally safe for all breeds and sizes. However, when the mercury rises to 16C to 19C, owners should start monitoring vulnerable dogs, including flat-faced breeds and those carrying excess weight.
The critical threshold is 20C to 23C, where all dogs face an increased risk of heatstroke, particularly during vigorous exercise. Dogs with breathing difficulties or underlying health conditions are considerably more susceptible.
Danger Zone Above 24C
Once temperatures exceed 24C, conditions become very dangerous for all dogs, with puppies and larger breeds at greater risk. At 32C or higher, heatstroke becomes a significant, life-threatening risk regardless of breed or fitness level, the insurer warns.
Jen Wormleighton, Head of Veterinary Services at Animal Friends Pet Insurance, said: "Many owners see dog walking as part of a healthy daily routine, but in warmer weather, it's important to adapt that routine to keep pets safe." She added: "Heat-related illness can develop much earlier than people expect, especially during exercise or when dogs are walking on warm surfaces. Simple changes like walking earlier in the day, sticking to shaded routes and ensuring access to fresh water can make a significant difference - it's about being proactive rather than reacting to extreme heat."
Preventive Measures
To reduce risk, Animal Friends recommends walking dogs before 8am, when temperatures are lower and pavements have not yet heated up. Keeping to shaded routes, carrying fresh water, and shortening walks also help keep pets safe in hot weather.
The RSPCA notes that dogs cannot cool themselves as efficiently as humans because they rely mainly on panting to regulate body temperature. The charity warns that heatstroke can quickly become fatal if untreated and advises avoiding exercise during the hottest parts of the day.
Vulnerable Breeds and Early Signs
Research cited by the Royal Veterinary College found that flat-faced breeds, overweight dogs, and older pets are significantly more likely to develop heatstroke. Many cases occur during walks or exercise, not just from being left in hot cars.
The British Veterinary Association says early signs of heatstroke include excessive panting, difficulty breathing, drooling, weakness, vomiting, and collapse. Owners who suspect overheating should move the dog into the shade, cool with cool water, and contact a vet immediately.
