Recently my sister's dog encountered a life threatening incident around a pool, she almost drowned since she couldn't swim, someone had to jump in to rescue her. Since then my sister is totally freaked out of the idea of her dog playing around the pool. Her house has a pool in the back yard and she doesn't know what to do to limit her dogs movement to avoid another incident. Someone suggested Dog Life Jackets, has anyone tried them? do you think they will solve anything?