Mine LOVE to swim! If they can get near a body of water- they are in it! The funny thing is they won't go out in the rain, don't want to get their feet wet, don't enjoy getting a bath... but they will dive head first into a creek or pond or even a puddle if it is big enough
I just recently bought them life jackets to help keep them from getting too tired when swimming. They are only near water when I am with them, we have a pond on our property they love to dip in and when we go for walks sometimes we will let them play in the creek along the way.
I have a baby pool for them to play in when in the back yard, but I haven't filled it up yet... maybe I will today- it is 90 degrees!