How do guide dogs know where asda is please?
I’m not sure what you mean by “asda,” but in general guide dogs aren’t responsible for knowing where things are. Their blind owners are responsible for that. The dog’s job is to identify obstacles in the path of the owner and signal the owner about that obstacle. It is always the owner who directs the dog where to go and the owner who is responsible for keeping track of where they are by counting doors and road crossings and so forth.