I’m not sure what you mean by “she” sat on the dog that was being bitten on her legs. Are you saying that your wife sat on the helpless dog that was being attacked and so the Akita attacked your wife? If that is what happened, what prompted your wife to sit on the dog? Was it because the dog she sat on instigated the attack or fight? Either way, you need to judge for yourself whether the deal you have in place or the procedures you want to put in place is adequate. You may not get a second chance to save at least one of your dogs.