Horse Thermoregulation Welfare: Managing Hot and Cold Weather Extremes

Horses are generally well-adapted to temperature variation, but extreme heat and cold create welfare challenges that require proactive management.

Key Facts

Horses can thermoregulate effectively between approximately minus 15 and 25 degrees Celsius with access to shelter and food
Heat stress is more dangerous for horses than cold — they overheat rapidly during work in hot, humid conditions
Anhidrosis — the inability to sweat — affects horses in hot, humid climates and is a serious welfare condition
Rugging horses that are already warm enough causes overheating, sweating under rugs, and skin problems
Access to shade and fresh water are the most critical welfare provisions in hot weather
Horses in good body condition and with shelter can tolerate temperatures well below freezing without rugs
Wet and windy conditions are more harmful than cold temperatures alone — shelter is the critical protection
Working horses in high heat and humidity without adequate cooling recovery time can cause exertional heat stroke

Welfare Considerations

Horse thermoregulation welfare is often mismanaged in both directions. Over-rugging warm horses causes sweating, skin disease, and overheating — particularly problematic when rugs are fitted and removed by staff who may not have assessed the individual horse condition and temperature. Under-providing for horses in genuinely cold, wet conditions compromises welfare through cold stress and energy expenditure on thermoregulation. The welfare-centered approach is individualized assessment based on the actual weather conditions, the individual horse body condition, age, clip status, and access to shelter rather than applying blanket rugging policies to whole yards. Working horses in extreme heat without adequate recovery is a serious welfare failure that can be fatal.

What You Can Do

Use rugs based on actual weather conditions and individual horse assessment — not blanket yard policies
Provide shade structures and constant access to fresh water during hot weather
Avoid strenuous exercise during peak heat hours and ensure adequate cooling recovery after work
Learn the signs of heat stress in horses — excessive sweating, elevated breathing, reluctance to move, and distress
Have your vet investigate if your horse in a hot climate fails to sweat appropriately — this may indicate anhidrosis
Ensure horses in cold, wet conditions have access to a windproof shelter with dry bedding
Monitor body condition score regularly — thin horses need more nutritional support to maintain thermoregulation in cold weather