So I moved in with my roommate in May of 2012. She has 2 dogs (Both Rescues) and her cat and my little Terrier named Moo. Her 2 rescues are a small terrier breed and a lab and pit mix. For the last 6 months all 3 dogs are fine at home alone with no one there. My moo and her lab pit mix even cuddle on the dog bed together. Last week before Thanksgiving her pit mix had a scuffle with her cat and On Monday 11/26/2012 Just before I was about to take all 3 of them for a walk my roommates pit/lab mix attacked my moo for NO REASON. Thrashed her on the ground and I had to separate them. I am afraid if I wasn't there and that had occurred when no one was home my little 22 lb terrier would be dead. She suffered lacerations to her ear and a nice sized puncture wound to her neck. This is her dogs second offence in attacking a smaller dog for no reason. We live in an apartment and are in a lease for another 6 months. What do I do? This situation is beyond me. The dog clearly has aggressive pit-bull like tendencies and I no longer feel safe with her around. Any suggestions anyone has would be appreciated!!!!