I would be more concerned with a large dog being capable of killing an adult, but I own a Lab and play with him all the time without any concern...i'll even hold a milk bone in my teeth and let him take it. I suppose it is possible that a house cat that is upset and still has it's claws could scratch deep enough to open an artery and kill you, if the circumstances were just right...
I'd fear the ham sandwich more RIP Momma Cass.