My dog bites! Help me help it?

well.. all i can suggest personally is make sure he knows you are in charge! do not let him control you that is probably the chihuahua in him that wants to be the leader of your household and boss everyone around and not listen. also some training would be very useful, since dogs cannot speak and you cannot speak to dogs you have to communicate through training let him know you are the boss and that his behavior is not acceptable