The Joker said "we'll how loyal a hungry dog really is". This is mostly true. However, german shepherds are very well known to only accept food from people they trust.
It's also what makes them so difficult to adopt into a new home. They may take weeks to trust new masters, which may lead to dehydration and starvation.
The point I'm trying to make is: if you want true love and loyalty, don't get a woman - get a german shepherd.