I recently started running with my two year old Belgium Shepherd. He only runs in front of me when he gets startled. The rest of the time he is about a step behind me on the right side. The problem is sometimes he gets distracted and lags back a bit, causing me to have to slow down or adust my running form, (arm swinging). Does anyone have any recommendations. I prefer for him to run right beside me, but wouldn’t mind if he pulled me along a bit to increase my speed.