My vet told me that introducing a dog to a household that already has a cat is much, much easier than introducing another cat.
It sounds like Sally knows her place - the cat is god and should be obeyed at all times. I would like a dog - Frankie is just a big kitten and would love someone to play with. Princess Merlin would kill it regardless of its size - she has HUGE paws and knows how to use them (and her teeth have seen some battles too).
***************************Good Luck to all three of you.************************
Susan, Frankie and Princess (Slasher) Merlin x