
My 3 go fortnightly, we book an hour, and the beastie has an half hour play session (his temperament means we can't let him free run), so his is purely for exercise, my girls go because of their hips. We originally went with Dolly after her cruciate repair surgery, and then started taking the rest of the brood.
The beastie just jumps, fetches his toy and swims back, but the owner of the pool gets in with the girls to make sure they're working their legs properly. The girls don't enjoy it really, and expend most of their energy trying to swim to the ramp and get out!
I love taking them, especially seeing the beastie having fun, he gets stressed out with change, but he loves it there, it's almost become an extension of our home, so his puppy side comes out.
The other really good thing, is they breed Wolfhounds, so I sometimes get to cuddle a puppy!!!! Sooo cute.