if you can find a chessie lab cross, get the runt of the pile or a female and do some repetitive work with it.
once they get what it is you want, you can move on to the next thing cause they got it.
straight Chessies are a different breed, they aren't lovey kissy dogs and don't do well in the house.
but if you need something fetched right now,,,, in 3' rolling waves, or somewhere with a 10 mph current they are the dog for the job.
the chessie lab cross knocks some of the not so affectionate part out, and takes the goof ball part out of the lab too.
they are great for upland hunting since they will just walk through a rose bush bramble instead of sniffing around it like the other dogs.