dogs and snow

What is it with dogs and snow? My dog went nuts the last time it snowed just a little on the deck. She went around rubbing her nose on the snow like she does on the carpet. She propels herself forward with her back legs and doesn't even use her front feet. The whole side of her face must get so cold out there, but not as cold as her legs must get when the snow is deep enough for her to prance in.