In "Empire of Grass," Tad Williams explores themes of trust and loyalty through the actions of animals compared to humans. The quote, "If you spare a dog he will never bite you, but men are not so trustworthy," encapsulates the notion that dogs, when treated with kindness, remain faithful companions. This idea reflects the intrinsic loyalty found in dogs, highlighting their reliability and the bond they form with their caretakers.

Conversely, the statement also suggests a critical view of human nature, emphasizing the unpredictability and potential betrayal inherent in human relationships. Unlike dogs, men may not show the same level of unwavering loyalty, indicating that trust can often lead to disappointment. This contrast sets the stage for the complex interactions and moral dilemmas faced by the characters in Williams' narrative.