What the heck makes you think the dog tells the owner when to go? Have you never actually watched a blind person crossing at a light with a dog? The person tells the dog when to go.
You listen for traffic and use good judgement and training. The dog stopped because it was a curb or a road and knows nothing about lights, there can be dozens of different lights at an intersection, in case you’ve never actually seen one.
Also, have you never found the main ATM out of order and waled over to one of the drive through ones? This isn’t Sherlock Holmes level stuff folks.