While running today with my almost-13-year-old Border Collie Felix, I smiled sadly at the number of times I had to stop to encourage him to keep going. I marveled at his tenacity to continue. I couldn’t help but think back to the days when he was leading the charge…when I was keeping up with him…when we both had a little more spring in our step. Together we have travelled many miles…and those miles have taken their toll. We’re both a little flabbier, a little more tired, a little less motivated. But neither one of us is willing to give up just yet.