WESTIE WALKERS - for Westies and Friends of Westies

Hi! Just wondering, does anyone out there have a Westie that swims? I woke up last night to find that our Westie, Halo had jumped into the swimming pool at 11pm and if I hadn't have heard the splash in my sleep, she would have drowned since she can't get out. Shes two now and never done this before, even after testing her with favourite toys and food. Just wondering if anyone else out there had had their dog jump randomly into a pool and if so, does anyone know why she might have done this? Madison!