Oh boy this one was a doozy. So first off, we have the title The Scarlet Shedder which I think is a reference to Hawthorne's The Scarlet Letter. The reason why I believe that there's a connection is because there's one scene where the judge and temporary chief destroy city hall and then decide to blame it all on Dog Man. This really reminded me of how girls were persecuted in the Salem Witch Trials for something that probably was not their fault. BUT WAIT IT GETS BETTER
because Pilkey literally dyes Dog Man red (from tomato juice). So from a child's perspective he's literally a "scarlet shedder." The judge and temp chief are also so corrupt (commentary on government corruption as well).
Ok next, the overall commentary in the Dog Man series is insane. The series highlights how society treats ex-cons. For example, Dr. Scum coerces Petey into becoming a "bad guy" again which is similar to how real-life ex-cons often have this struggle of past acquaintances trying to turn them to their old ways. On top of that, there's also the stigma that ex-cons will always be "bad" which is demonstrated when Petey asks others for help rebuilding his lab. I don't think I'm explaining this all too well, but just trust me on this (I need to do more research).
This book also has commentary on artificial intelligence. Pilkey admits in the notes that he drew the robot with visual inconsistences to "reflect how A.I. often creates continuity errors in consecutive images." I myself wasn't able to find those inconsistencies but I was also reading on my tiny phone so I could have missed it.
Next, we get more flashbacks of Petey's childhood, but this time, focused on his mom. Can I just say, this plotline broke my heart. Because we see how much she wants to teach Petey to look at the bright side. For example, after getting out of the hospital (where Petey's dad didn't show up), we learn that the family has been evicted. Because he's a little kid, Petey asks why theres a lock on their door to which his mom responds that "it's somebody else's turn to live here." Like the way she tries to keep a positive spin on everything because she wants to be a good role model for Petey.
In the same flashback, we also meet LITTLE JIM. THIS IS THE ULTIMATE INVISIBLE STRING. Because Petey meets Little Jim at the shelter with his mom. And bro, Little Jim's parents are dead. The reason why this is an invisible string is because Little Jim grows up to become BIG JIM who is one of Petey's jail mates. Again, I feel like this highlights how the system is set up to ensure that people who are disadvantaged stay disadvantaged. (Single parent household, orphan, etc. both end up in jail for reasons not entirely known.)
And to end everything off, we finally get Petey starting to see himself as a good guy. In the past few books, he's very insecure and hesitant to call himself "good." This caused such a reaction in me that I cried and started to re-evaluate everything about life.
To sum things up, Dog Man is more than just a children's book and shows how even older audiences can enjoy these books. If you haven't read Dog Man yet or seen the movie, what are you even doing with your life.