Hot water bottles can present problems as well. They are not of the size and shape to be used with ease on a horse. When wrapped on the limbs or tucked under a blanket, they have a tendency to slip down or fall out. Should the stopper accidentally come out, you have the danger of scalding. Single leg whirlpools are designed specifically for the horse.
Whirlpools provide the effects of gentle massage and superficial heat.
The agitation of the water can loosen scar tissue on the skin surface and help remove debris from a wound. An iodine concentrate added to the water will reduce the possibility of transmitting infections and aid in cleansing abraded skin. Of course, the horse should be as clean as possible and the whirlpool boot should be disinfected before use if an open wound is present. A thermometer to check water temperature is essential for safety and effectiveness of hydrotherapy. If a tank is used, it must be plastic or rubber, never metal, to avoid shock hazard.