While your dog’s ancestor, the ancient wolf, could cover up to 60 miles each day in pursuit of food, domesticated dogs are a different story and aren’t built for sustained running over long distances. Running can strain your dog’s tendons and joints, especially if they’re too young. Developing skeletons are at risk of permanent damage when pushed beyond capacity. Most vets recommend waiting until a dog is at least a year old before training them to run with you, longer for large breeds.
Your dog’s stature can also impact their capacity to run for long distances; those with shorter legs and snouts might have trouble keeping up over long distances. Always err on the side of caution as your dog won’t know when to stop.