Pig the Elf (Pig the Pug Series) by Aaron Blabey

From the award-winning creator of Pig the Pug comes another laugh-out-loud book, filled with holiday cheer! Santa was coming! 'Twas bigger than big! No one loves Christmas more than Pig. And the world's greediest pug will stay up all night to get his presents! When Pig yips at Santa and finds himself joining in on the flying sleigh ride, things quickly get out of hand in a way that is pure Pig pandemonium.