Twinmike,

I used to snow camp with a large furry border collie/ Aussie cross that liked to be close. She was really warm, but remember to provide insulation for your dog from the snow. It works well to zip them up in a parka or heavy fleece jacket. Usually they will still be in it in the morning.

My current border collie is 14 years old so I now zip her up even on summer trips.