I have not seen any evidence of dogs being more intelligent than wolves.
A human can teach a dog to perform a trick much more easily than it can do that to a wolf, which is the standard test of (human-useful) intelligence for canines, and variations in trick-learning ability are massive between breeds.
A human can teach a dog to perform a trick much more easily than it can do that to a wolf, which is the standard test of (human-useful) intelligence for canines, and variations in trick-learning ability are massive between breeds.
Perhaps a wolf is simply less cooperative with humans.