My friend had two Chessie littermates he brought into his house when he had an older Lab/Beagle mix. The pups and the older dog hit it off right away, and even though the male Chessie was over 100 pounds, and the female was almost 75, the 60 pound older dog remained the boss until he died suddenly at almost 15. The male Chessie changed from a love everyone. as long as the boss was ok with it, to a very protective dog. I have keys to the house, and when the old dog had just died, I walked in, and the male went nuts, until he saw me, then he went into wiggle mode. If I was a stranger, I would have gotten the hell out as fast as I could. Those two, and the other Chessies I've known over the years seemed to all be more "serious" than the Labs, and aren't as laid back as even the field type Labs are. My Pit mix had a Chessie buddy for years, and he was a great dog who died at 7 due to some rare cancer, but the others all lived to be quite old. My friend's male was almost 14 when he died, and the female was nearly 16.