I lived in Alaska for 20+ years and because the fall, winter & spring were always so wet & mucky(in Anchorage) we always took our shoes off when entering any house. Funny - you could always tell a Cheechako. Go to any gathering at anybodies house and there would be one guy who would leave his shoes on. He would come in, sit down and pretty soon he would see that he was the only person with shoes on. You would see him get up, sneak over to the door and remove his shoes. It only took once, but it was what everybody did to try and keep the yuck at bay.