I also have two Shelties, but they are young still, 5 and 6. The only problem they have is that they were poorly bred, and have bad bones and hips. And loss of sight and hearing s common in eldery dogs, and I don't know if it's a Sheltie thing, I'm not too sure though. And by the way if you have any pics of them I would love to see them if not too much trouble, I love my Shelties.
Shelties: Not enough words to describe how much I love them.