They already exsist. Have for ever . But there not bullies  this Iis a common look for  big blue pits and  presas .. dogos  some corsos   this not out of ordinary   research   big blue pits  this was so common in the 1990s to early 2000s  you should have seen them   they could hang pull work   and now theres  bullies and blue nose   the  80s   had dogs  bullets were the only thing to stop them now they cant run across the yard with out panting