I would definitely pick one that fits your personality as well. I got mine four years ago, pick the most stubborn, bull headed dog in the litter. He didn't dissapoint me, constantly pushed his limits, tested how tough I was willing to be on him, and eventually settled into a good routine. Took a little longer to train him than I think it should have, but then again, it was definitely worth it. Now we get along great with no aggravation between us!