I really hope some of these techniques in here will help with your yorkie. I would hate to see you have to give one up. I'll be thinking about you! We've been having some similar problems, too. (Although not as bad IN the house.)
Cheyenne is now 7 months and has been a total alpha female since she entered our house at 12 weeks. Cody is my sweet 3 year old male. They are both fixed. They play constantly and there haven't been many biting issues. Cheyenne is extremely protective of the food and toys though and it is bothersome. Although she has been a great playmate of Cody's and he adores her, he seems a bit fearful of her. She intimidates him. There have been times when she has attacked Cody and bit him after baths. she does not recognize his smell and sees him as a different dog entirely. CRAZY!!! If I use the same dog shampoo I normally do, she is okay. If I use something different, she has outright attack and bit him on a few occasions. He has been shaking in a corner after those attacks.
The major problem that we have with Cheyenne is OTHER DOGS!! She is a major attack dog and while she is on the leash walking through the neighborhood, she has gone after HUGE dogs in a very aggressive manor. I'm afraid she is getting a bad reputation. I don't think I'll be able to hide behind the "she is just a scared puppy" excuse much longer. I know she seems very afraid of these dogs and I think that is why she is acting out this way. She seems afraid of people, too, and won't go near them. (If they come into the house, she loves them) Any help for this puppy? I've been trying to work on the alpha dog thing and she does think she is boss. the hints in this thread will help, too.
Thanks,
dawn
Cody

and Cheyenne