Most dog breeds were developed with a specific purpose in mind, for example, sporting, working, herding and so forth. Consequently, whether your pet is a purebred or mixed breed, chances are he carries genetic traits that drive him to pursue an activity.
Many modern day dogs don’t get opportunities to do what their breed instincts tell them to do. In addition, it’s a rare dog that exercises on his own, and your backyard doesn’t provide the variety of sensory stimulation most dogs need to ward off boredom.
Dogs need walks for both exercise and mental stimulation.
According to Clinician’s Brief:
Generally, people walk their dog for 4 reasons: elimination, mental stimulation, exercise, and training. Dogs like to go for walks to get outdoors, sniff and engage with their environment, exercise, and perhaps socialize with people and dogs outside the home. There is no reason that a walk cannot encompass and meet all the needs of both humans and dogs. Because time is often at a premium, it is useful to help owners understand and find creative ways to meet these needs.