whenever my dog comes into the house, she immediately positions herself at the front door. when someone comes near, she begins whining and wagging her tail. this morning when she saw me, she nudged me and followed me around excitedly as i went to get her leash. at first i thought she was just going to do her business outside, but she didn't -- and all she wanted to do was go for a walk. she's usually very lazy and calm, but once she's out (which happens once or twice a day), she 

ulls on her leash and wants to go everywhere! do you think she's looking for her previous foster owner (because when she's out, she seems like she's whining and looking for something)?
anyway, i just don't want her staying at the front door all the time because a lot of people pass that way and she might accidentally get hit, especially when the door opens and closes. but she always sits and lies down there despite my calling her to the kitchen or trying to give her some dog toys to play with. when i bring her to another part of the house, she simply goes back there. how do i stop this from developing into a habit?