Hi I'm a proud parent of 3 dogs. One is 4 years old  Rat Terrier {Angel} another is 2 years old Rat Terrier {dixie} and the third is a daschound named libby 2 years old.  My ratt Dixie has been very aggresive towards my libby for about 6 to 8 months. We got both of them about a week apart so they have grown together. But it has been so bad that it actually is a major dog fight . It takes all i got to get them apart. We got Dixie spayed thinking that would help but it's not. Just today i let them all out to potty this morning and they came in and she attacked libby under one of my kids bunk beds and i really thought she was going to kill her .My family loves these dogs so much I just don't know what to do. I'm in tears.  Please someone give me some advice.

Thank you