I've had Labs and Chesapeake Bay Retrievers. Both can do the job. Chessies tend to be a little hardier when it comes to cold weather. I now have a Chessie and I love her. Chessies can be hard headed though. Well, Labs too. Whatever you decide, buy from a reputable breeder. See the parents, get OFA or PennHip certification on hips and elbows. Spend time at the breeder's local, watch the dogs, generally the pups will end up like the parents. My personal preference, Chessies 1, Labs of any color 1b, goldens 3, Nova Scotia Tolling dogs 4.