Boxer Dog

How can I get my new boxer dog well with my other dogs?
I just received a 2-year-old boxer from a friend who is moving and, unfortunately cannot take the dog w / you. She has been home for 2 days now. The bad news is I have 2 dogs and others (including women's and cross breeds) and continue fighting with the new settler. are now in separate parts of the house because they always bark and fight. I know that dogs are territorial, but long will this last? Is there anything I can do for them to get along with each other?
Ceaser Milan NOT working method! I've used it myself. I brought a female boxer 2 years age in my house with my other boxers two adults and 2 boys. The new woman was aggressive at first, but after I established I was the leader of the pack and it was not. I made this to me and my other dogs and quickly fell in line. People say not to use his method obviously have never used or were going to see how well it works. Why why people are negative about their work when it has saved the lives of many dogs that have been stifled by the aggression had not intervened and taught what to do. Please at least look at his book or see their program, they have it on DVD too, before deciding against it. Good luck.
TALKING DOG! OSCAR THE BOXER