Bringing home a new puppy is an unforgettable event in anyone's life, including other dogs. In fact, many dogs wait patiently for the day they get a built-in playmate and BFF, which is why it's become so common to film a pup's reaction to meeting their new little sibling. Or, in the case of a precious new new puppy named Lily, her family filmed her reaction to meeting both of her big sisters!