These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Jerkass Woobie: While he gets a little too excited about his son, it's hard not to feel sorry for Senex when he is killed by Cockatrice.
Moral Event Horizon: Cockatrice crosses it as soon as he grows up by murdering Senex rather callously and shoving the body aside.
Squick: A basilisk gets into the Coop and kills the Wee Widow Mouse by hiding inside the body of a Wild Turkey it killed.
Cockatrice's birth.
Tear Jerker / Crowning Moment of Funny: The last scene of the book, where Chauntecleer and John Wesley Weasel argue about who's going to join Mundo Cani under the Earth in fighting Wyrm somehow manages to be both simultaneously