To do either of these things we have to understand the structure of the muscles we are going to be attacking. To build strength and muscle size the other fibres must be stimulated by intense muscular exercise. This is done when the dog gallops or sprints, or in some other way exerts all out force. Doing this kind of workout every day breaks the dog down instead of building him up. Lastly, anaerobic work always creates a chemical byproduct called lactic acid.
Lactic acid causes muscle stiffness and soreness.
But there is a way to help get rid of the lactic acid. Instead of finishing a hard gallop and then lying down, lactic acid will be better removed from the body if the dog does a little bit of aerobic exercise after the anaerobic exercise is over. From this you should also see a couple other things. One is that the dog that needs or can best benefit from added strength should focus a bit more on the anaerobic program. The dog who needs greater endurance, however, will be better served if his coach has him do a bit less of this exercise and more of the aerobic.