Pitbulls and kids?

it depends on the 15 year old kid a bulldogs owner needs to b an alfa if he isnt things can go bad i have an ab and a 12 year old son i did all the training but i have no problem with my boy haveing the dog out around his friends dogs or other people he knows to b firm with her but i allways tell him if him and his sister r home and some one comes to the door to let her in cuz in the house she is adifferent dog but if u know the 15 year old kid and he knows wat he is geting in to and he is responable there shouldnt b a problem