A close friend of mine's Shit-Zoo lived to be 19 years old, so you might have a lot more time left than you think! I have seen a few older small dogs here with glazed over eyes and they just trot down the road behind their owners, they work it out somehow, probably by sound or smell. I do find it very endearing when I see these human/dog duos... they won't give up on one another and are a very cute team.