In general, the “wet” cooling methods performed better than the dry methods, and cooling the limb as well as the foot was more effective than chilling the hoof alone.
as the foot was more effective than chilling the hoof alone. For instance, applying an ice pack to the hoof produced a median hoof wall surface temperature of 19.8 degrees Celsius (67 degrees Fahrenheit), while an icefilled bag covering the hoof and pastern lowered the median to 5.2 degrees Celsius (41 degrees Fahrenheit).
The wet methods were more effective, says van Eps, because they undermined a body’s natural insulation. “The hair on a horse’s limb is designed to prevent the conduction of heat out of the vessels---that allow rapid increases in net blood flow to the foot,” he explains. “These are typical of thermoregulatory organs, like the ears of an elephant; they help the animal maintain temperature. In the horse, they make cooling much harder, as the horse can rapidly and massively increase blood flow to the foot, replenishing the tissue with warm blood, warming the tissue. For this reason, it is important to cool the incoming blood, and this requires cooling further up the limb.”
The one dry application