2. Check for signs of heatstroke
As temperatures rise, so do the risks of your horse experiencing heatstroke —a potentially life-threatening condition that develops when a horse is unable to cool himself by sweating. Any horse can be affected, but horses that are overweight or out of condition are at most risk.
Make sure you check your horse regularly, especially after riding, and if your horse is rugged.
Signs of heatstroke to look out for are:
Profuse sweating or no longer sweating (for extreme heatstroke)
High respiration rate (above 20 breaths/min)
Rapid heart rate (above 50 beats/min)
Dry, hot skin that won't return when pinched
High rectal temperature (above 38?C)
Lethargy or distress.
If any of these symptoms are present, provide your horse with water and shade immediately and seek advice from a vet.