the book opens with the mc finding and describing (not graphically) a dead dog. the dog didn't die naturally, it was killed, but you don't see that happening. it is a driving point in the book and mentioned fairly often
Protagonist is a stereotype of autistic people. He’s also ableist to higher support children which is implied to be an autistic trait but they’re completely separate and this conflation is harmful.
the main character/narrator has autism and is often verbally berated for it (more specifically for not understanding things, "throwing a fit", etc), sometimes even physically