Um, if my housemate, V, who is half a foot taller than me and weighs twice as much, decided to beat me up, I don't think I'd have much of a choice about being a victim. He can run faster than me, he is stronger than me, he could squash me, he knows a martial art ... I could knee him in the groin, pull his hair, or possibly hit him with a dressage whip. xD
So I'd probably just stick V in between me and the rabid dog/rabid human and let him sort it out!
If you believe everything you read, better not read.