You must consider your dog's breed. Some breeds are naturally more suited for long-distance running. These include athletic and energetic breeds like Australian Shepherds, Border Collies, Weimaraners, and sporting dogs. However, short-muzzled breeds like bulldogs or pugs may face difficulty breathing while running due to their unique respiratory system. Dogs with short legs may be unable to keep up with your pace, while larger breeds are prone to hip dysplasia.