Arguably the most important thing you will ever teach your dog is the recall (COME). A young woman in a red dress is crouched at left in the foreground of the photo. A black & tan Dachshund mix is running excitedly toward her across an open grass field.
Without a reliable recall, you can never give your dog any freedom. And without being given any freedom, your dog is much more likely to make a break for it any chance he can and he will be less likely to come once he’s loose