My experience with Labs tells me they are very intelligent dogs. Not only does this feature make them good assistance dogs, but also their willingness to please.

I think every dog is intelligent in its own way. It all depends on how well a dog solves problems, willingness to learn, ease of training, etc. What is intelligence actually based on?
Would I consider Springen a highly intelligent dog? Not exactly. He learns commands extremely easily and is easy to train, but, problem solving wise, not so much. lol His goofball personality makes him seem even less intelligent than he really is. He's smart and wants to please, but I wouldn't consider him close to a breed like a Border Collie.
Both of my cocker spaniels have been incredibly hard to train. They want to keep you happy, yes, but things just don't "click" easily in their minds. I know they aren't easy to potty train, proven by both of my dogs. However, it says they are a smart breed and learn commands fairly easily. My experience doesn't show that. Or maybe I'm just horrible at training my dogs? lol Doesn't matter though, because they really want to please and don't get in much trouble with or without training.
Molli is just like her breed says. Poodles are smart dogs! I haven't taught her many tricks, but you can tell she's very smart.