Updated on August 26, 2020 by Ana Amongst the smartest small dogs that make intelligent small dogs list are Poodle, Shetland sheepdog, Papillon, Pembroke Welsh Corgi, Yorkshire terrier, Fox, and Rat Terriers, Brussels Griffon, Cairn Terrier, Miniature Schnauzer, and the Schipperke. Interested in particular smartest small dog breed?