Please turn on your javascript, or upgrade to javascript-enhanced browser. More information . Hot, humid weather creates extra stress on your horse's cardiovascular system. This can result in heat stress or exhausted horse syndrome. Also, too much sun, especially on areas with pink skin, may result in sunburn or photosensitization.
Heat stress is the biggest concern.
When a horse fails to regulate its body temperature to heat or exercise, or when there is excessive fluid and electrolyte loss from sweat, serious medical problems can occur. The most likely candidates for heat stroke are poorly conditioned horses in hot, humid climates. An excessively hot horse will be depressed, weak, not eat and may refuse to exercise. Pulse and respiratory rates increase. Electrolyte-loss sweat includes significant amounts of sodium, potassium and chloride.