I just wanted to mention that I took Zach out for his first bike ride today. He did awesome for his first time. A couple of times he wanted to pull a bit so we would go a little faster but the great majority of the ride there was slack in the leash and he trotted along. I'd like to do this a few times a week as he can get more exercise in a shorter amount of time. Otherwise I generally walk or jog with him twice a day. He weighs about 77 lbs., but I'd like to see him more like a lean 73 lbs. We'll see what happens.