See Spot think.
Dogs can be as smart as 2-year-old children, according to research presented in 2009 at a meeting of the American Psychological Association. Border collies are the top dogs in the intelligence category, with some in the breed capable of understanding up to 200 words. Poodles, German shepherds, Golden retrievers and Dobermans round out the top five smartest breeds. (The most popular breed in America, the Labrador retriever, comes in at number seven.)Older breeds like hound dogs, bulldogs and beagles are among the slow learners of the doggie world, the researchers reported. Unlike newer dog breeds, which are designed for companionship and sociability, old breeds were bred to sniff and hunt, perhaps giving them more brawn than brain.