My roommate has a 2 year old male chihuahua that keeps pooping in the house. The animal was found as a stray and has always had this issue on and off since he's owned it. He's at a loss on training it and I honestly don't know what to do either, every dog I've owned has been properly broken in as a pup and I have no idea how to reverse engineer an adult dog that's already in this habit. It's not usually a frequent thing, usually occurring every couple weeks or so but lately it's happened 3 times in the last 2 days. The dog gets plenty of time outside, more than most and still he seems to wait until he's inside to go - always poop, never pee. And he's very sneaky about it, nobody's ever caught him in the act. We don't want to have to do it this way but it has to stop somehow otherwise the next option is for him to be caged all the time. Can anybody provide any pointers on how to get this animal in line without having to go the cage route? We also have a black lab who is very well behaved and has never had this problem. Any advice will be greatly appreciated.