I bought Buddybear one of the small blue hard plastic ones a couple of weeks ago. He has 3 water safe toys I tossed in.....he would walk around the edges biting at the pool, mind you I only put a couple of inches of water in it. Finally he got in long enough to pull one of the toys out.
He's not a water dog apparently but I do hope, it might take all summer, that he will eventually enjoy it.