We've had our puppy for a week now, and he was doing so well at going outside to go potty, but then he had a couple of accidents. Now it seems like ever since his first accident he now thinks it's okay to pee and poop inside. Do you think that once they go in the house it's all over from there, and you have to start all over? I can just imagine what is going through his mind, "Hey, I did it in here before, I can do it again!"