My 3 month old peekapoo puppy was doing so good with potty training, I have been using the puppy pads, and she would always go on them, and would only have occaisanal mistakes. However, over the past week or so she has had some behavior changes, she goes wherever she wants and has just been a little brat, biting and chewing everything! Before she would bite things and I would tell her a stern NO, and she would stop, now I tell her no and she thinks it's a game. Is this normal behavior? I was thinking that it may have to do with the fact that I started school and perhaps this is her way of acting out, because before I started school I was with her all day, I would even take her to work with me. I think I have spoiled her. It is just hard for me to tell her no and to leave her alone. WHat is a good way to discipline her when she does bad things?