Okay, so I am in a very strange situation. My family is in the US Army, and we are stationed in South Korea. Our friends have left for the states, but they could not bring their 2 year old boxer Daisy with them, due to airplane conditions. We decided to keep Daisy and bring her back to the states with us in 3 months.
We currently have 2 dogs, a 1 year old Shih Tzu (Arie) and a 6 year old Dachshund (Brownie).
Arie is perfectly fine with Daisy, but Brownie completely hates her.
When Daisy is trying to eat, Brownie comes up to her barking, nips at her neck, then eats the rest of the food.
Brownie is constantly watching Daisy, and when Daisy makes a sudden movement Brownie jumps up and scratches and lightly bites her and barks very loudly.
Brownie whines constantly ever since Daisy has came (about 4 days ago) and seems to be miserable.
There isn't anyone we can give Daisy to that can watch her, and we live in apartment buildings so if this barking continues we will get kicked out. Also, I don't want anyone getting hurt and I want my doggies to be happy!
I could never sell Brownie, that would kill me.
What should I do?!?

ps.Sorry about how long!
pps.Brownie isn't fixed, if that has to do with anything.
THANK YOU!