My first question--did you report the bite, especially if it broke the skin? Animal bites are to be taken very seriously. I would recommend calling the city Animal Control to at least report it if so. Also, does your son need medical care? I had a coworker that was hospitalized for a bite wound that got infected. First things first...is your child ok? Is the dog current on vaccines? (Sorry--I work in the veterinary field.) Also, I agree with the others--speaking with your roommate about boundaries etc.