How far can Labrador retrievers swim?

Any age. Just make sure the dog has a life jacket that FITS him/her. I have a friend who has a weiner dog, her dog is only a couple years old. So just make sure it has a life jacket. Or if your dog is a big German Shepherd or Great Dane, make sure your dog can swim. If your dog is too big for a life jacket and can't swim. Sorry.