For myself, I have an australian shepherd. I picked him because he was the only one at the pound... er, animal shelter... who looked like he had a brain in his head.
This was two mistakes. One, I got a male. Boy dogs roam around the neighborhood, so I had to lay out a 270 foot wire and put him on a dog run. I should have gotten a girl who would stay at home. Two, I got a dog who is TOO smart. He keeps figuring out ways to get off his run.