@Dramaattheschoolgate We don’t tell them our destination, but give them step by step instructions. These are relayed through a combination of voice commands and hand signals. In theory it is our job as the handler to know the route. So for example, personally I do things like count the number of roads we’ve crossed to keep track of where we were on my mental map so I can then tell him when to turn etc.
Essentially the dog is trained to go in a straight line from one kerb to the next, avoiding obstacles, indicating stairs etc. When they hit the kerb we then tell them which way to go.
I say “in theory’ because they are very bright and can do familiar routes on auto pilot really, even though we should keep giving the commands. E.g. if I were to leave my house dressed for work in the morning I have no doubt my guide dog would happily take me to work with no further instructions from me.
Also as mentioned above they will often offer you familiar places as you pass them which is helpful.
They are also trained to find specific nearby things on command. What’s they are taught to find depends on what the owner needs, but mine can find lifts, escalators, steps, chairs, doors, shop counters, bins, wide ticket gates at stations etc.