Bitches are programed to let down so many eggs each cycle, her health, our timing of breeding and the studs fertility are the only other variables as to number of pups whelped.
If she's becoming upset with the other hounds, I'd move her off to herself, it's good to have the bitch in her whelping area a couple weeks before due date so she's comfortable when the pups come. These last two weeks the pups will flesh out and become bigger(over feeding won't give you more pups, only bigger pups), don't tear her teats up running her as they fill out.
Best wishes with your puppies...
