Another problem in "dog intelligence" is that a lot of it is misconstrued with obedience. Sure, dog A and dog B both understood the command you issued; and the one that gets labelled as "intelligent" is the dog that chose to follow that direction versus the other dog who made up his own mind as to what to do.

Most scent hounds are perfect examples of this. They never have high representations at obedience competitions, but put an obstacle between them and what they are tracking, and you will see amazing problem solving skills.