What action did Enzo take regarding the papers Denny was about to sign?

The action Enzo took regarding the papers Denny was about to sign is significant in the context of the story and reflects Enzo's loyalty and protective instincts toward Denny. When Enzo took the papers in his mouth, ran away, and peed on them, he was symbolically expressing his disapproval of the situation and his desire to shield Denny from making a decision that could lead to negative consequences. This act demonstrates the depth of their bond and Enzo’s understanding of the stakes involved. It also showcases Enzo's unique perspective as a dog who perceives human emotions and intentions, making it a critical moment that emphasizes the theme of loyalty and the instinct to protect loved ones.