risk assessment

two dogs, one massive and the other small, nose to nose are about to fight. Here's the thing: the small dog has not done a risk assessment becuase he's about to be mauled by the much bigger dog. However, the big dog has also not done a proper risk assessment because he could swallow and choke on the little dog. This, apparently, is a risk assessment...which is all well and good for dogs, but what are we to do?