We found 2 Reddit comments about Pippin The Christmas Pig. Here are the top ones, ranked by their Reddit score.
Was it "Pippin the Christmas Pig"? Pippin The Christmas Pig https://www.amazon.com/dp/0439650623/ref=cm_sw_r_cp_apa_Pql0Bb3JZ5VQJ
This is not old enough to be your book unless it is a 2nd printing but I'll throw it out there... https://www.amazon.com/Pippin-Christmas-Pig-Jean-Little/dp/0439650623