Ok to start of I am trying to get my girlfriends yorkie house trained and it is driving me nuts.... I should probably say that I am by far not a fan of yorkies because I not care for tiny dogs. A little to demanding for me, but I love my girlfriend and will deal with it. Her dog has a dog door so I am confused as to why it always burns one in the house????? Plus it will not go in the yard to pee...... It pees on the concrete????? Is this just do to there size, that they do not like getting in the grass? I have tried giving her treats everytime she goes out side, but that has still not made a dent. I will deal with a lot of things but I will not put up with dogs that poop in the house, please help before I go nuts......Any suggestions or history of your own problem and how you overcame it would be greatly apreciated.