None of mine will swim
But I hope to sort that this summer
Right now, I keep mine in condition with roadwork, WP, a-frame, flirt-pole and general craziness about the house..lol..
I have seen dogs that swim a lot that are very overweight.
As with people, I guess the 'trick' is a combination of diet and exercise..
Something I want to do this year is run the dog alongside my pushbike... see what 5-10 miles of running every other day does for my dogs overall condition.