Holly the hooligan
Holly has some mild spondylosis in her lumbar spine which doesn't cause her too many problems yet. It will however progress as she gets older so swimming will help to maintain the muscular support of her spine. Being a German Shepherd she is very likely to suffer with osteoarthritis in her joints as she gets older. This exercise in warm water will help to maintain joint health and range of movement while also giving her safe, comfortable exercise to maintain her cardiovascular fitness.