You can judge a man's true character by the way he treats his fellow animals.

The line proposes that moral character is revealed most clearly in how someone treats beings who are vulnerable, voiceless, or socially “lesser” in status. By shifting the test of character from human-to-human interactions (often shaped by reciprocity, reputation, or power) to human-to-animal conduct, it frames compassion as a principle rather than a transaction. The phrase “fellow animals” also stresses continuity between humans and other creatures, implying ethical obligations grounded in shared sentience rather than species membership. In effect, the quote argues that kindness to animals is not a niche preference but a diagnostic of empathy, self-restraint, and respect for life.