my black lab is 6 mo. old today! anyway, i've been having some trouble walking him. he understands the 'heel' position while walking or standing, but when walking (both on and off leash), i've got to remind him every 5 seconds. if there is nothing happening, he walks perfectly at my side. but if he picks up a scent or there's a noise in the distance, he starts speeding up . constantly. are there any specific training methods or techniques you guys would recommend to keep him focused on me and where he is in relation to me, regardless of what else might be going on? do you suppose the regular walk/jog has gotten too boring? thanks for any input.