Bugsy is a 2-3 year old mix at the Genesee County Animal Shelter where I volunteer. Bugsy has a cataracts problem with her eyes so she cannot see, but she actually gets around at the shelter very well. She has learned exactly where her kennel is and has learned where the doorways are to go out for walks. She is extremely social with humans and loves going for walks and runs (I indeed look a little odd sprinting around a parking lot with a blind dog).
http://www.youtube.com/watch?v=GgFThr14l9k