Jack Russell Terrier

Question
I have a female Jack Russel Terrier that is 5 years old.  We have had her for almost 4 years.  She is super smart.  She had a 3 pups 1 1/2 years ago and we sold 2 and gave one to family because we were going to keep one but fell in love with the father and ended up keeping him.  She has always been a "queen bee", snappy at our other Jack Russell and our lab.  But it has seemed to get worse in the last year.  She used to snap at the other dogs but then walk away with her head held high like "so there!  I am the boss".  But now she will attack them.  SHe is really mean and will not stop unless we physically stop it.  No amount of yelling will stop it.  She is trained well except for this.  She will not stop and has hurt our old lab and the other Jack Russell to bleeding.  It is out of control.  We have an underground fence and tried the training collar, to no avail.  We are considering getting rid of her but our son is devistated.  She is NOT fixed, do you think that would help?  When we get her off the bleeding dogs, we tell her she is bad and put her in her kennel.  HELP!!!  Thank you so much

Answer
Get her spayed. It will help but they ALL need to be neutered. The male too. She is exhibiting sexual and territorial aggression and she won't stop unless she is spayed and they are fixed as well.

No amount of yelling will help this. You must stop that as it only makes them worse.
Get her spayed and then re-bring her back into the fold slowly. She needs time to heal also. You can also try medication if things don't calm down.

Amitriptyline is a fairly safe drug that can be used to calm the dog down. I would talk to your vet when you get her spayed about putting her on it for a while.

I hope this helps and she mellows out. Let me know how it goes.