[Deber]

We have many dogs and had that problem with barking and nervous biting with a female of ours. I think that the tension of barking escalates the nervousness. I decided to become a bigger pack leader! I think we tend to let these smaller dogs rule because they are so small and loveable. I first taught the "sit" which yorkies learn very quickly. Then had my husband come to the front door. When the yapping started I stepped in front of the dog which placed ME as pack leader. Then I forced her back, away from the doorway, of course she is barking the whole way. Make the "Shuss" sound as you crowd her backwards..do not use "no", just the sound. When you have moved her back a bit, showing you are in charge, ask her to sit and give her a treat. When she didn't feel threatened she stopped the barking and the door crowding. I also carried it further and forced her to "wait" at the door until I go out first (she used to lunge at the door to go outside). We also treat her for NOT barking, when the postman or people pass by the window. She took a few weeks but now watches people pass and looks to us for her treat. It is not perfect but much much better. For the aggressiveness you might try walking her and wearing her out a bit. When dogs do not get enough exercise it can lead to biting and other aggressive traits. Lots of hard excercise, remember these are terriers and can take a fair amout of good excercise, treats for GOOD behavior, nothing for bad behavior...it is working on ours. I only use the "NO" for really bad things..there is something about the "Shuss" sound that really gets their attention!!
Hopefully you can use something in this LONG post that may work on your baby..it has helped us a lot.