Dog
Dogs have achieved legendary status in loyalty, with documented cases spanning millennia of unwavering devotion. Hachiko waited nine years for his deceased owner at a train station. Greyfriars Bobby guarded his master's grave for fourteen years. These are not outliers but representative examples of canine commitment. Dogs will defend their humans against threats real and imagined, including but not limited to vacuum cleaners, suspicious leaves, and postal workers who clearly cannot be trusted. This loyalty requires no contracts, provides no escape clauses, and operates regardless of the human's objective merit as a companion.
The Joker
The Joker considers loyalty a character flaw to be exploited. His relationship with concepts like faithfulness, commitment, and reliable alliance could be described as aggressively antagonistic. He has betrayed every associate, abandoned every scheme when amusement waned, and demonstrated repeatedly that counting on him represents a fundamental category error. His only consistent commitment is to inconsistency itself. The Joker's position on loyalty is that it makes people predictable, and predictable people make less entertaining victims. This philosophy has not generated the warm reputation that dogs enjoy.
VERDICT
Dogs have perfected loyalty across fifteen thousand years of dedicated practice. The Joker has perfected the opposite with equal dedication but considerably less appealing results.