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The answer here is yes, you do need to walk him. Believe it or not, dogs loose in a back yard seldom will get the exercise they need. Their time may often be spent sleeping or lounging. Try taking your canine out for a walk daily or several times a week to build strength, burn calories and for a change of scenery. His behavior will improve for they will have spent any pent up energy and you'll burn off a few calories at the same time!