Engaged in military as well as civilian occupations, guard dogs serve on sentry duty, patrol duty, shore watch, riot control, store and warehouse security and many other similar missions. Whatever the nature of their mission, all guard dogs have one thing in common: their high degree of training.Every guard dog is trained to maintain a peak performance for the entire time it is on duty. Ordinarily this is for extended periods of time. Such sustained performance requires huge amounts of energy. The guard dog also needs large amounts of energy to cope with the extreme emotional stress that occurs while the dog is on duty. Often, during periods of sustained performance, a guard dog's energy needs exceed that of a female during lactation.Because of this greatly increased consumption of energy,...