Hey Charlene.. good luck with everything.. I too have a 12 week old puppy right now. But he is a big doggy.. or he will be he is a German Shepherd. He is a hand ful but so adorable wouldnt trade him for the world. We have had him since he was 7 weeks.. we are still having a lot of potty training issues but whatever you do dont push her nose in it.. just anytime she goes in the house say a firm NO! rightawayand then take her outside right away so she knows oh this is where you goand when she does go in the right placegive her lots of praise.. over praise.. and soon you will notice she will whine to go out. Right now they still dont have a lot of control of their bladders so they have a hard time holding it. They teeth actually about about 4 months.. so around 15 or 16 weeks they get their adult teeth. We got our puppy lots of toys for chewing and one u can put in the freezer for teething. If she ever chews on hands or something she is not supposed to just give her a firm "OUT" and hand her what she is supposed to chew on.
LoL i am going to a dog trainer right now cuz my puppy obedience classes were included with my pup and i guess a firm"out" sounds like the mother dog when it corrects the pups.
Good luck they are alot of work.. heck.. i just had to wake up to take my puppy out.. he needs to go out every 3 to 4 hours. He is getting better now to where sometimes he can wait 5 but usually pees in the kennel. So thats why i am awake now.. just fed him too.. if you have any other questions lemme know. I have had a few puppies before. Puppyhood too.. depending on the breed of dog can last until 1 year for some breeds and others (like my husky mix) up to 3 years.
Take care and good luck again!
\"Dance like no one is watching, Love like you will never be hurt, Sing like no one is listening, Live like heaven on earth!\" Mark Twain