Equal opportunity puppy raising

To raise a guide dog puppy, you have to have a house with a relatively large backyard. This makes sense because guide dogs are large breeds who like to run around.

But what happens when a doggie raised in a big house with a big yard gets assigned to a person who lives in a small apartment? Maybe the adjustment would be easier if some puppies were raised in apartments from the beginning?

(Yes, this is just a ploy to get me an adorable widdle guide dog puppy like the one in the Eukanuba commercial).