Which dogs are the smartest?

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I was wondering which dogs are the smartest. We have a rottweiler and he was really hard to train. Basically we gave up on him and he became an outside dog. My husband then got me two indoor dogs, cockerspaniels. One was black and the other was a wheat color. The black one(Ebony) was a little slow, but the wheat color one(Brandy) was really smart. The breeder told us that cockerspaniels are all a little dense, and that Brandy was not the norm. We now have two poodles and I find them to be very intelligent. It's like they are talking to you. They are really easy to train and very neat dogs.