Labs are such good dogs...They have such warm dispositions and they are so into their people.
I'm mighty happy for your Dad.. Shadow seems to have fallen into it as well..
They do seem to be a good match. A puppy was never an option. My Dad is almost 83 and my Mom just turned 81 and starting with a puppy is/was not in the cards. Someone has really trained him well. The vet thinks he might be 5ish.