Trench foot
Trench foot can be prevented by keeping the feet clean, warm, and dry. It was also discovered in World War I that a key preventive measure was regular foot inspections; soldiers would be paired and each made responsible for the feet of the other, and they would generally apply whale oil to prevent trench foot. If left to their own devices, soldiers might neglect to take off their own boots and socks to dry their feet each day, but if it were the responsibility of another, this became less likely. Later on in the war, instances of trench foot began to decrease, probably as a result of the introduction of the aforementioned measures; of wooden duckboards to cover the muddy, wet, cold ground of the trenches; and of the increased practice of troop rotation, which kept soldiers from prolonged time at the front.
Horse care
The legs of a horse require routine observation for lacerations or swelling. Everyday care involves brushing the legs with a brush to remove dirt and mud. A currycomb is generally not used below the knees. It is common to have excess hair trimmed from the fetlock to prevent excess accumulation of mud and moisture that may lead to skin problems, such as rain rot or scratches. Many riders wrap the horse's legs with protective boots or bandages to prevent injury while working or exercising. After a ride, it is common for a rider or groom to hose off the legs of a horse to remove dirt and to ease any minor inflammation to the tendons and ligaments. Liniment may also be applied as a preventative measure to minimize stiffness and ease any minor strain or swelling. If the horse has been overworked, injured, or is to be transported, a standing bandage or shipping boot may be placed on the horse's legs for protection, to hold a wound dressing, or to provide support. Leg wraps are useful in preventing injury or for treating horses with leg injuries. Veterinarians may recommend using wraps during rehabilitation to prevent further injury. Another common use for leg wraps is to protect the legs of horses while being shipped in a horse trailer.