This sounds like the title to a dumb post. After all, who wouldn't want to have a smart dog, right? But intelligence is different from obedience, trainability, and energy level, and a smart dog isn't necessarily an easy dog.
People who don't know Biggie or the kuvasz breed sometimes think that he is "dumb" because he's not particularly obedient, he does everything at his own slow pace, and he is basically silent unless he's guarding. The rest of the time, he moves slowly, doesn't always make direct eye contact, and definitely doesn't have the perky, "ohboyOHBOYwhatarewegonnadoNEXT?!?!?" look that border collies seem to have perfected. Since he's not totally focused on people, preferring to keep tabs on them without looking like he is, they underestimate him and forget he's around until he Anal Torpedoes them with a sly grin on his face.
PRO: Biggie knows lots of tricks and commands and picks them up within a few tries...
CON: ...but he only does them when he feels like it, and would much rather learn new tricks than practice his old ones.
PRO: Makes up his own new games and teaches people how to play them just by using body language...
CON: ...Not all humans want to play Anal Torpedo, Hide-and-Seek, Indoor Football, or Bobbing For Rocks. And sometimes even I don't understand the games he wants to play (What game involves a rope bone, puppy bed, towel, and metal food dish at the same time?)
PRO: An intelligent dog is a great problem solver.
CON: An intelligent dog is a great problem solver: will find ways through or around every obstacle if properly motivated, including unlatching doors, training and manipulating humans, and knowing just how far to take the naughtiness.
PRO: Is a great communicator.
CON: Can be demanding. (Luckily Biggie doesn't do this, but some smart dogs with a high energy level will find ways to communicate their desire to eat, drink, go out, and play whenever they want, which is not always when YOU want. If you have a vocal dog, he will quickly figure out that barking leads to attention.)
CON: An intelligent dog is harder to forgive, because he *knows* he's being naughty, and chooses to do it anyway.
CON: Difficult to dupe. (Our old dog, Boo, was not so good at coming when called, but we could always dupe him by jingling our keys and asking, "Want to go in the car?" Not so some other dogs we know.)
CON: Can be stubborn, because they know how far they can take it, and because they can't be duped. If you have a dog with an independent temperament, this will be a challenge because they won't do stuff just to make you happy; you have to show them it's in their best interest to comply. And even then sometimes they act like they aren't really being obedient - like Biggie executing the "down" command during his Canine Good Citizen test.
CON: May start to train his humans.
The upshot? You have to be smarter than your dog, and aware all the time of what the dog is learning from you. And since dogs aren't people, you can't reason with them, bargain for good behavior, or explain why they should really listen to you. Given how many WTFs out there own dogs, maybe it's a blessing that there are obedient and dopey ones out there.
(Update: As I post this I see Biggie trotting off in the shadows holding something in his mouth. Why do I just KNOW this is not an "approved item"?)