The Dog Knight by Jeremy Whitley
Frankie knows who they are. They're a drummer, they're nonbinary, and they're . . . the Dog Knight? One day Frankie is a relatively normal middle schooler, with relatively normal challenges, like finding the perfect outfit to wear during their upcoming drum solo. Then, they save a friendly golden retriever from bullies and wake up in a giant magical doghouse, with a funny looking helmet, talking to a group of dog superheroes called the Pawtheon. If Frankie can prove that they possess the six dog virtues of loyalty, kindness, honesty, justice, stubbornness, and smell, they will be named the Dog Knight and be given the power to fight the forces of chaos. Maybe there is more to Frankie than they thought?