I have 3 Shelties, only one likes the water, Matlock lives to ride the jet ski, so since he does like the water, I got him a doggie life vest from Ruff Wear. When Matlock has his vest on, he knows he can get in the water and not have to do much swimming, he just floats around and paddles a little. I suggest to all if you are near the water with your Sheltie, get him,her a doggie vest and you will not have to worry about them falling in especially in the winter.
But to all of this fun, We have to stay on top of the ear-matting when they get wet.
Pretty scary, though, with such deep, fast water.