We have two Jack Russells - mother and daughter and I'm relieved to say they have never fought. The mother is definitely the dominant, sensible one and her daughter the comical character.
Although we have no intention of separating them I don't doubt the younger one would thrive in a one dog household.
JRs need a firm hand, plenty of exercise and a routine but that just about refers to any dog. From reading your posts I think that both dogs would benefit by being separated as JRs do like their own territory.
Have they been spayed BTW? This can often make a difference to aggressive behaviour between two females.
Thank you Pipin for everything.
Worried I will miss out on my grandson
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on losing your beloved Westie