Only seen one did with swimming as the primary work. Swimming was a last resort because she would not do anything. Roadwork started off with her out front, then beside you and then you dragging her back home. She would not turn a mill with something faced off to her. She refused to swim also, but she figured out there would be negative results to choosing not to swim. LOL. She was in OK shape. I can't denounce the swim keep as a whole based on her, it was the first one we did and she was not a good worker at all, but she was a good dog. I say she won in spite of the swim keep. I have always wanted to see one with someone who was experienced with it and a dog that put forth effort. Then I could for a more informed opinion. Interested in more info on this topic. EWO