Well you can't be mad at a face like that ! she is adorable ! ! Puppies will Mouth EVERYTHING, its how they explore the world. Puppies also have to learn what is acceptable behavior. Hershey is 1 year old now, and he only chews on his toys, in the beginning he wanted to chew on our hands, or Nip us, but a sharp *OWW* and he would get the idea (even a loud OWW when it didnt really hurt, is the secret)
Peeing in the house. She is only 12 weeks old, are you kennel training her? Kennel training is very important, it protects the puppy from the house, as much as the house from the puppy. It only takes 1 electrical cord being chewed for a deadly disaster.
Keep reading all of these posts here, we're full of great information, and help and remember PATIENCE PATIENCE PATIENCE. If you can raise a kid, ya can raise a puppy (This is from the guy who has 4 grand kids, and *NO* Kids of his own! gimme a puppy over a baby anyday