She's probably just hissing and refusing to eat because she's in so much pain and scared of the dogs. Once she's out of Kitmo, she might very well adapt nicely to a loving home. As Emily said, permanently sore feet might mean you need to try different kinds of litter, but as long as she's safe indoors she ought to be all right. I've met quad declawed cats who were perfectly calm and otherwise healthy. Ramps, ladders, or stairs can help a quad kitty get onto beds and even windowsills.
Love, Columbine (feeling sad :( for the little kitty)