My little (well technically she is a giant for her breed) Sheltie, Beignet.
Smartest dog I have ever owned, stubborn as shit though. Plays mind games with me all the time when teaching her new tricks. She picks them up immediately but will half ass them just to fuck with me. The worst is fetch. She will not play fetch with me, but when I don't pay attention to her, she will start getting her ball and bringing it to me. Then when I stop what I am doing to play fetch, she refuses to play anymore. Sometimes she will play fetch with my wife while I am around just to fuck with me, then when I try to start play, she quits.
Got her trained as a therapy dog, been wanting to bring her to a kids hospital for sometime now. She loves kids.