Turtle Tears

I have a compilation of mid-century Christmas radio hits. Among these, which is the song that makes me cry every time I hear it?

Is it the Roy Orbison tear-jerker "Pretty Paper"?
Is it the wistful "I'll Be Home for Christmas"?
Is it "Have Yourself a Merry Little Christmas", which is so apt this year?

No. It is the novelty song "Snoopy's Christmas", the hero of which is a cartoon beagle.