My fiance's family had a German Shorthaired Pointer up until 1.5 years ago. Even at 10y/o she loved being in the water and would swim for hours at a time if we let her.
A couple great parts about her: being short-haired you could literally squeegee the water off her and she'd be mostly dry by the time we got to the truck. She loved being on any kind of water craft - paddle boat, kayak, canoe, 19' Neptune - and because she swam so well, there wasn't a lot of worry if she went overboard, which is a good quality when you're running across a lake at 25MPH, a loon pops to the surface a little ways out and the dog jumps overboard to go after the bird.
Knowing she could hold her own around water and be safe was most comforting.
I'm sure Makai will chime in here... He and his pup (named Makai) are the epitome of "A boy and his dog."
I have a Wirehaired Pointing Griffon, and my dog is the best water dog i have ever seen. like the Port. Water Dog, she has a non-shed coat. she point, swim, & retrieve like a champ, and has the best personality ever!