What breeds of dogs are considered the smartest in the world?
I would say border collie and poodle

In my opinion, all dogs are smart and intelligent regardless of their breed.

among small dogs papillons are the smartest i believe
YOUR OWN dog is always the smartest! xD
Ohoh I've heard that American Cocker Spaniels are often described as not so intelligent dogs, is it true?
Border Collies.