I'm so sorry to hear about your baby Faith… I commend you guys for taking her even though she has serious health issues. Sometimes dogs of the same sex have issues being under the same roof… especially if they are both type A personalities. Many members on here have used nothing in life is free technique w/success. I will tag the thread for you one here… or you could get in touch w/a personal trainer. I would say since Faith has health issues, maybe Fiona is taking advantage of that fact to make herself the alpha female. Good luck and keep us posted!!!