My wife and I are thinking about getting a second dog. Our current dog is a shepherd/hound/? mix that we adopted from a nearby no-kill shelter. He's been great! Based on his interaction with other dogs during our pet sitting jaunts, I think that he would enjoy a companion. We want a dog that's smart enough to be obedient, but not one that becomes destructive when bored. Also, we prefer a medium-energy dog, who is happy with about 45 mins - 1 hour of exercise each day. Thoughts? Recommendations? Bonus: picture of Argo.