Dogland Network member David B. said in a message to me;
i have seen about the guide dogs i have been offered a chance to under go something called a blindfold walk? i dont know what it is because ive not heard of it before
David, here are a couple of links that explain the concept of Human Blindfold Walk... an exercise in trust.
You are talking about dogs, however... specifically GuideDogs.
This is an experience in which a sighted person learns to trust and follow the cues of a seasoned, well trained Guide Dog.
Rather than try to explain, or quote other people's definitions, I offer these choice videos that will show the concept well.