This book was recommended.
OLIVE THE OTHER REINDEER. A story about a dog, who thinks she is a reindeer, since she has heard the lyrics "...you would even say it glows, all of the other reindeer, used to laugh..etc"
I have bookdepositoryed it for christmas, and found it has also been animated. So here tis the link - seems to be Drew Barrymore as Olive?
Operation advent goes on. Up to number 17 today.... on the 1st December....