Kozmo and I went on a 4 mile run at De Anzo cove at Mission Bay this week, it was great to run with him again. I was surprised by his fitness level, he made it the entire way without walking and only became slightly sluggish during the last 1.5 miles. I remember a year ago when I would run with him and he would want to stop and walk at 3 miles. I guess even when dogs lose weight they feel better, and can run faster.