Similar to other "How Do Dinosaurs..." books. All the naughty behaviours are listed first - do dinosaurs steal the presents and empty the stockings? etc.
"No. A dinosaur doesn't."
He does all the nice things - eats all his dinner and clears the plates, goes carolling, wishes his grandparents Merry Christmas. etc.
The only part that made me hesitate was the very last line that says, "Merry Christmas, Merry Christmas you good dinosaur!"
The whole "good vs. bad" dichotomy is so last generation, and I can't help but flinch when parents/adults call a child (or dinosaur) good or bad. I'm sure most readers, including kids, would not notice or give a second thought to the "good dinosaur" statement, but especially paired with the idea of getting gifts for being "good" and the image of a dinosaur receiving a big present from their parents just rubs me the wrong way.
Maybe the word "good" could be replaced with something like "sweet," which is less often used as a judgement statement.