5 degrees and sunny, snow on the ground. Sam is in the back yard enjoying every minute of it - rolling in the snow, digging out old toys, etc. He does not want to come in.

He has a heavy curly coat but I wonder about his feet. I'd like to think he'd ask to come in when he got cold but maybe not.

How cold is too cold for a suburban housemutt?

Don't know what to tell you.

Our dogs were always quick out and back in during cold weather. No lingering.

At 5 degrees in snow all of the goldens would start dancing around, picking up feet, and unable to walk back to the house within a few minutes of being outside. The Newfs were much more durable but they still weren't out for long periods of time but that was us bringing them in rather than waiting for them to come in on their own.

My neighbors had huskies. Those guys would go outside and curl up in a ball and fall asleep in the snow, sometimes to the point that they would be covered by fresh snowfall.

I know, this doesn't really help much....

I saw something online about this recently, but I don't remember where. Sorry.

Have seen Malamutes and Chows sleeping on the snow in 0F weather.
The Welsh Terrier loved to play in the snow. Never seemed to be bothered by the cold until her last year.
The Schnauzer would try to trot without putting his feet down on ice. Otherwise he was ok with the snow, but not enthusiastic.
Horse for courses, or something like that.

I've never had a dog that had a problem. We have never put boots on them.