ok.. :) since i know alot about animal behaviour ill attempt to answer this question but there are too many variable at stake to solve the complete problem without knowing more information. 1. when you dog does bite someone... and you try to do something to stop it.. you are reinforcing the dogs behaviour - either by punishment or reward. 2. when you pay atteation to your dogs aweful behaviour it think you are rewarding it.. 3. now submission should work if done properly and consistently. when you dog does this you should get him on the floor.. on his side.. and make sure he submits. the dog is submissive when he stops struggling on the floor. 4. you could do a classical conditioning experiment on the animal.. now all animals are afraid of loud noises. when the dog bites someone.. you should be ready with a pan and a metal stick. right with the bite occurs (within 3 seconds) you should smack the pan with a metal stick as hard a possible to create the loudest noise possible. when this happends repeatly it should scare the dog and frighten it. check it an experiment on a human called "little albert" 5. any atteation is positive atteation. 6. sometime small dogs like to bite things when their baby teeth are falling out. this is common.. and spay may not work... even infant humans bite things when their teeth are comming out.. ok.. ill stop for now.. if this dosnt work then ask me to explain more