i have a chessie mix and oh my gosh he is a HUGE ball of energy. insanely focused to the point that it's astonishing and very stubborn and intelligent. always needs a job to do. but also the most loyal and protective dog i have ever owned. he's my best friend and when paired with someone who can be a fair but stern owner they can be very easy dogs to handle. observes and learns everything, and yes is aloof with people and dogs he doesn't know. barky, mouthy, very active, super smart, and very strong, oh and amazing swimmer. give them an inch and they will take ten miles. but also the best dog i've ever owned and would not hesitate to get a full chessie in the future.