Our family bought a little Yorkshire Terrier in February, so this is her first Christmas in a home.
I took her for a walk today, and one of our neighbors had a nativity scene in the front yard. Not realistic, just white plastic figures to be seen at night.
The dog barked at them the whole time we were within 50 yards of the house. She did better on her second walk, just growling on closest approach.
Must be hard for dogs to understand the differences of the world around Christmas. Except it's more stuff to chew.