I have 4 dogs. a small Shih zu, 2 female Rott mixed dogs and a male Rottweiler. ALL my dogs are very very friendly with people and other dogs. a very good friend of mine is going thru a hard time and has to leave to cali and cannot take her female 1 and 1/2 old boxer. i told her i would keep her untill she comes back..in a few months but the dog is very friendly with people but is very scared. she is trying to attack my dogs thru the cages im scared to let them lose together. hope someone can give me some tip on introducing this aggressive dog to my other dogs...