Our experience with our dog, Dodger, is that he does not like water. When we get him out of the car at the place where we give him a bath he starts to shake and pulls as hard as he can on the leash to go the other way. When there is water running in a shower or a bathtub, he will not go near the bathroom. If we are using a hose outside or the sprinklers come on, he immediately runs into the house. If he sticks his head out of the dog door and there is even a sprinkle of rain, he comes right back in. He even walks around puddles.
So we were very surprised when he was running with a couple of bigger dogs at the dog park and ran right with them into the dog swimming pond. Doc was afraid Dodger couldn't swim and thought he was going to have to go in after him. I told him they call it "dog paddling" for a reason. It is something dogs know how to do. (Doc is a little over-protective where Dodger is concerned)
He ran into the water without a moments hesitation.