Our 90lb. 4-year-old Doberman wears a Web Master harness. Marshall is so full of energy, he will calm down when we tether him to a golf cart and trot and canter him for 8 miles through hayfields and woods. He is so focused on the run, he will screech and bite at the front tire of the cart until we are moving at a good speed. Marshall is non-reactive to people, dogs, and traffic; his only focus is running. If the cart is going too slowly, he will pull with all his might until the speed pleases him. He gets to run next to the horse farm every other day. On the off days, we speed around the perimeter of our 5-acre yard 6-7 times, and he is satisfied. Your harness is of such quality, it does not wear out for years.