Dog always takes my slipper

Why does my 125 lb mixed breed always greet me by running to the door, licking me, turning around to ask me to scratch his butt, and then promptly grabs one of my house slippers (which are always at the front door) and then runs with it to the opposite side of the house where he jumps back into his bed with it? Resulting in me wearing the one remaining slipper while I walk to find him and get the other one (usually with no fuss). Does everyone’s dog do this when they get home? He will sometimes grab my slippers at other times even before I get home, but if they are at the front when I get home he seems to never fail to grab one and take off with it, just to make me go to him (at which point he gets a lot of affection). I guess I trained him inadvertently (or he learned on his own) that grabbing my slippers will make me pay more attention to him as soon as I get home!?!