Heat Advisory for Horses

Veterinarians from UC Davis offer 10 important tips to prevent heat-related problems in horses.
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One external cooling method for horses with an elevated body temperature involves applying cool water (much like a rider would when hosing a horse out after a ride) or cool wet towels to the horse. | Photo: Photos.com

The summer months can produce extremely high temperatures, especially in California. Here, University of California, Davis, Veterinary Medical Teaching Hospital staff members John Madigan, DVM, Dipl. ACVIM, ACAW; Gary Magdesian, DVM, Dipl. ACVIM, ACVECC; and W. David Wilson, BVMS, MS, MRCVS, offer 10 important tips to prevent heat-related problems in horses:

1. Heat can kill.

High environmental temperatures and related heat issues, including dehydration, exhaustion, and heat stroke, can occur in horses and can produce illness and death. This is serious business and you must take steps to ensure your horse is protected when traveling in a trailer or being ridden on trail rides or competition events.

2. Provide water.

Help your horse maintain hydration by allowing free access to water at all times. It is a myth that a hot horse drinking water will experience colic or other medical problems. Never let your horse pass up a chance to drink water. Only horses that have been deprived of water for a significant time (many hours or days) need to have water provided in smaller amounts over time. Let your horse drink on the trail or after a class at a show.

Hint: You can lead a horse to water, but you can’t make him drink. This is true, so offer some hay and your horse will often drink after eating the hay. Soup-consistency bran or pellet mashes are another means of getting extra water into your horse

3. Provide as much shade as possible.

4. Limit what you do with your horse during peak heat.

Aim to:

  • Ride or compete with your horse in the early mornings when it is cooler;
  • Have the ride or event management consider a change in the program schedule to limit afternoon activities during peak heat;
  • Shorten your ride;
  • Go slower and provide frequent breaks for your horse, in shade; and
  • Encourage your horse to drink whenever they want water.

5. Ventilation is key.

Provide open vents and windows in trailers which can open for cross ventilation (however, don’t let your horse stick its head out while on the road).

6. Know signs of fatigue and overheating in your horse and stop before more severe signs of heat exhaustion begin.

Normal Adult Horse Vital Signs & Health Indicators (Interactive)
RELATED CONTENT: Normal Adult Horse Vital Signs & Health Indicators (Interactive)

Watch for:

  • Persistent high respiratory rate that does not come down with rest over 10 to 30 minutes (normal is 20-40 breaths per min);
  • Change in mentation, decreased energy level, and reluctance to keep going;
  • Dry mucous membranes (i.e., gums) in the mouth (they should feel “slimy”);
  • Prolonged capillary refill time (Push on your horse’s gum. They should be pink to start, then it will blanch to white after pressure, and return to pink in approximately one second. Check this at the start of your day and frequently throughout the day. If it is prolonged, your horse is trying to tell you to stop, rest, provide water, and, if other signs of colic or muscle pain occur, you need to stay put and seek veterinary attention); and
  • Lack of gut sounds. Listen at the start of your day (if you don’t have a stethoscope put your ear on your horse’s flank- behind the ribs). You should hear gurgling sounds on both sides of the belly– that is normal and good. Quiet gut sounds are a warning that your horse may be heading for dehydration or exhaustion.

7. Consider using fans.

If your horse lives in a barn with limited ventilation, try to arrange more air circulation by carefully placing a fan in front of the stall or in the aisle way. Keep electric cords out of reach of horses.

8. Hose (spray) off your horse or pour water from a bucket over your horse.

Cool water is fine, normal temperature (not hot) water is good, too. Evaporation produces cooling and continuous hosing is one of the most effective means of lowering body temperature.

9. Have a water source while traveling.

Keep a supply of water available for your horse to drink. Obtain some clean five-gallon cans and fill them up with water before you travel.

10. Electrolytes might be useful if the horse has been sweating excessively.

Only use if they can be followed by access to water to drink. Have a plan outlined by your veterinarian if you have not used electrolytes before. Only use electrolytes specifically made for horses.

Tips for Trailering in the Heat

If you need to trailer your horse, do so in the cool early morning or late evening hours when it is cooler. Don’t leave your horse in a parked trailer, especially if there is no shade. Just as with a parked car, temperatures inside a trailer can rapidly reach 140°F and the horse can quickly develop heat stroke. Provide as much ventilation and airflow as safely as possible on the road. Be very careful with hauling foals—they appear to be even more susceptible to heat than adult horses.


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