(Again, sorry for having butchered the name for the title and tags but it has to fit)
Gryla, Leppalúði and their sons have a pet too. A gigantic cat sometimes also called Yule Cat and just as malevolent as his owners. He walks around the snowy streets and countrysides during Christmas Eve ; depending versions, if he crosses your path and you do not wear holidays clothes, either he will eat all your food at home, or it will eat YOU. Added late to the Icelandic holidays ogre family, only in the 19th century, many think he has much more ancient but never written origins

Jólakötturinn © Icelandic folklore
Drawing © me