There is no doubt that a dog can make a great running companion and sometimes is the best personal trainer an athlete can have. As these canines are happy to exercise over longer distances and times, it is important they maintain a steady weight so as not to put any undue strain on their joints. This is particularly true for breeds prone to joint dysplasia, such as Border Collies and German Shepherds.
Obviously, daily running or hiking will provide a dog with an opportunity for great exercise and this will have an enormous health benefit as long as the animal has been properly trained up in the first place. Having undergone a thorough examination by the vet, it is best to start the dog off with an activity such as walking at a modest pace over a short distance, gradually increasing the speed and distance over a period of time. This allows the dog to build up both confidence and stamina.