My little pup spends most of his time outside with my other dogs, but I do like to bring him inside when I come home from work for a little bit. The problem is that the first thing he does when he comes in is run to the kitchen or down the hallway and pee's. I'm not sure why he does this. I haven't really done any traing because I figured if he spends most of his time outside I wouldn't have to worry about potty training him and him going inside the house. What is the best way to stop him from doing this?