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How Hot is Too Hot for Dog Walks in Greater London?

June 22, 2026

With severe high temperature warnings in place this week, and temperatures in Greater London forecast at around 29 – 36°C, we’re re-sharing some of our top advice articles on avoiding heatstroke in pets. As always, we’re here if you need us in an emergency or for general advice and pet care – call 0208 943 2303.

Warm weather in Greater London can be lovely for us, but it can spell danger for our four-legged friends. Even on a bright day below 20°C, or a cloudy one in the mid-20s, our team at Alpha Vets’ urges caution when thinking about walking your dog – heatstroke in dogs can develop faster than you might expect.

In an emergency, call us straight away on 0208 943 2303.

 

Why heat affects dogs differently

The team at Alpha Vets explain that dogs don’t cool off like we do. While humans sweat to regulate temperature, dogs rely mainly on panting – and that’s far less effective, especially when they’re active. Heat builds quickly in dogs, and unfortunately, exercise can make things worse. According to the RSPCA, dogs are far more likely to develop heatstroke while out on a walk than when left in a hot car – though both are extremely serious.

Know the signs of heatstroke in dogs

Here are some symptoms our team want pet owners in Greater London to look out for:

  • Rapid, heavy panting
  • Trouble breathing
  • Drooling more than usual
  • Low energy, confusion or wobbliness
  • Vomiting or collapse

If you notice any of these signs, move your dog somewhere shaded and cool straight away. Pour cool (not icy) water over their body – avoiding their head – and seek urgent veterinary help. Avoid using wet towels, as these can actually trap heat instead of helping it escape.

You can reach Alpha Vets on 0208 943 2303.

See all our emergency information

 

How warm is too warm for dog walking?

As a rule of thumb, our vets in Teddington suggest that once temperatures reach around 24°C (75°F), most dogs are at risk during walks. But it’s not just the number on the thermometer that matters – problems can start to develop from just 20°C (68°F), particularly for certain dogs.

  • Below 20°C (68°F): Usually safe, though you should still consider your dog’s individual needs – full sun at lower temperatures can still be problematic for some dogs.
  • 20–23°C (68–74°F): Getting warmer – there’s a moderate risk of overheating, especially during energetic play.
  • 24–27°C (75–81°F): High risk of heatstroke for lots of dogs. It’s safer to skip the walk or keep it very short and gentle.
  • 28°C (82°F) and up: Danger zone! It’s best to stay indoors or stick to shady garden time.

Other things to think about

  • Breed & health: Brachycephalic (flat-faced) dogs, puppies, elderly pets, and those with medical conditions are more vulnerable.
  • Activity level: A calm wander might be okay—but anything vigorous could quickly raise your dog’s temperature.
  • Hot surfaces: Pavements can get much hotter than the air. Do the ‘hand test’ – if you can’t hold your hand on the surface for 5 seconds, it’s too hot for paws.
  • Sunshine & humidity: Still air and direct sun can turn a warm day into a real hazard.
  • Distracted dawdles: Stopping for a chat? Keep an eye on your dog – shade, water, or a short break could make all the difference.

Safer walking in the heat

In warmer weather around Greater London, it’s best to walk your dog during the coolest parts of the day – first thing in the morning or later in the evening. If it’s too hot, it’s perfectly okay to skip the walk and try a bit of indoor play or garden exploring instead.

Extra tips to help keep things cool

  • Stick to shady paths and avoid open, sun-exposed areas.
  • Bring water for both of you.
  • Keep an eye out for changes in your dog’s behaviour or energy levels.
  • Shorten the walk or swap it for low-key enrichment indoors.
  • Apply pet safe sunscreen, especially on light-coloured dogs and areas with less or no fur

When in doubt, it’s always safer to play it cool. If you’re ever unsure, our vets in Teddington are happy to help.

If you have any concerns about your dog’s health in the heat, get in touch with Alpha Vets right away on 0208 943 2303.

See all our emergency information