Who knows and it is really not a huge concern of mine either. I just thought it was nice how he was so bothered by the wind outside that he lay by the front door to make sure all was well. He is my pet first and foremost I did not get this dog for the sole purpose of protection, just another member of the family. Too be honest, with the back wards pussy laws in Canada if someone came in the house I would rather deal with them so my dog was not put down. MM.