How Hot Is Too Hot for Dogs, Cats, and Horses?
A vet-approved temperature guide to help keep dogs, cats, and horses safe in hot, humid weather.
Updated
May 4, 2026
Photo by Chewy
Summer heat affects every animal differently, and humidity can make warm days riskier fast. Use these temperature guidelines to decide when to limit outdoor time, add cooling support, or call your veterinarian.
Key Takeaways
- Dogs generally need extra caution above 70 F, and outdoor activity should be limited as temperatures approach 80 F and higher.
- Cats can overheat when exposed to high heat, especially above 80 F without shade, airflow, or water.
- For horses, add air temperature and humidity to estimate heat risk before exercise.
- Provide fresh water, shade, and cooling breaks, and contact your vet if your pet shows signs of overheating.
How Hot Is Too Hot for Dogs?
- Below 70 F: Most dogs are comfortable.
- 70–79 F: Use caution with long walks or extended outdoor time. Brachycephalic breeds and senior dogs may feel the heat sooner.
- 80–89 F: Limit activity to short walks. Keep playtime indoors or offer water if outside.
- 90–99 F: Avoid outdoor time except for quick bathroom breaks.
- 100 F and above: Stay indoors. Temperatures over 100 F can be life-threatening.
Cooling gear for dogs
How Hot Is Too Hot for Cats?
- Below 80 F: Most cats are comfortable.
- 80–99 F: Indoor cats may overheat if outdoors. Outdoor cats may be more acclimated but should still be monitored.
- 100 F and above: Bring outdoor cats inside.
Cooling gear for cats
How Hot Is Too Hot for Horses?
Horses are affected by both heat and humidity. To assess their safety, add air temperature (F) + the humidity percentage and compare to the guide below:
- Below 130: Minimal risk. Normal exercise is generally safe.
- 130–149: Low risk with proper hydration. Seniors and horses with conditions like anhidrosis, the inability to sweat normally, are more vulnerable. After exercise, provide water and hose your horse down.
- 150–180: Moderate risk. Limit activity to hand walking or tack walking for a short period of time (15-20 minutes) and cool horses with water after exercise.
- 180 and above: Severe risk. Do not exercise.
Hydrating supplements for horses
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