I have adopted two blind dogs over the years; Miss Maxine, who was 12 and Jennie, who was 6. Both dogs maintained their active lives. (As a matter of fact Miss Maxine was famous on her for her column so please Ho read this link to see what an old, blind dog is capable of. http://www.zimfamilycockers.com/Forums/ ... f=7&t=2842
Other than babble balls and such, it's a good idea to keep rooms scented differently. Try putting cinnamon scented poi pourri in the kitchen, lavender in the bedroom, etc. It helps the dog discern where he is. For the first little while each blind dog was in the house, we'd wear a bell so the dog could track where we were. Walking the dog on a retractable leash was also a benefit because they could feel a pressure from it as they walked to orient themselves to where they were. Obviously if you move around furniture they will need a time of adjustment.
A blind dog can be as much of a companion and loving pet as a seeing dog. We seem to be more bothered by it than they are once they get used to it. I can't imagine putting a dog down because they can't see.