Too often on such occasions one feels, as I feel so strongly with regard to poor old Stilton, that the kindly thing to do would be to seize the prospective bridegroom's trousers in one's teeth and draw him back from danger, as faithful dogs do to their masters on the edge of precipices on dark nights.
P.G. Wodehouse humorously conveys the protective instinct some may feel toward friends about to make significant life choices, such as marriage. The narrator compares this urge to that of a dog trying to save its master from peril, suggesting a deep sense of loyalty and concern for well-being, especially in regards to the character Stilton.
This analogy emphasizes the absurdity and gravity of the situation. Just as a dog is instinctively driven to avert danger, the narrator experiences a strong desire to intervene before Stilton proceeds with a potentially disastrous decision. Wodehouse's writing reflects the complex emotions tied to friendship and the often comedic challenges faced in navigating personal relationships.