I recently took care of a dog that was pretty old, he was a greyhound mix. He's mostly deaf and blind, but he still got around fine. When I would walk in the house he couldn't hear me so I would scream for him at the top of my lungs then he would come and greet me. He wasn't very active mostly because of his age, but he still enjoyed our daily walks. So while this dog didn't have much vision or hearing left he was still a very happy dog and I'm sure he's still going to be around for a few more years.