Some dogs just naturally take to the water as they are bred for it. Some are mutts and have some spaniel, setter or other dog that loves to romp and swim in it. I can tell you that all my beagles I ever had, wanted nothing to do with water - pool, streams or baths. The very best of them simply tolerated a bath and I was just pleased to not have to fight with them. My current girl (beagle) Ginger is one who is not too pleased to get a bath but will tolerate one. Now Bob, our scruffly mutt (not sure heritage) loves his baths. And I take him fishing with me and he just goes in and out of the lake at his leisure. Usually only go out up to his neck, but will fetch a stick as long as he doesn't have to swim too far out.