At 12 1/2, Stone is showing his age. He had a dental a few months ago and had a hard time coming out of the anesthesia. We knew that this would be his last. He developed a lump on his neck recently and luckily, it appears to be a benign blood vessel tumor with no real threat. But, everyday, we wonder just how much longer Stone has. It’s inevitable when you have super senior dogs and you see them aging by the day. But, as long as he is still eating …