I am SO sorry Connie. Society definitely failed this girl. NOT you. I don't know what actually happened either, but free-roaming cats in a room with a dog? Sorry, what vet lets that happen? I don't even know what more to say...
She's beautiful. I know it's not the guy's fault, but if it were me and there was nothing in the lease, I'd fight that landlord. But, that's just me. Sorry Lexie. You WILL find the right home.