Why does Mr. Berry need four of these huge dogs?  
(Female: 120–170 lbs, Male: 160–230 lbs)  There is no way anyone could control four of these beasts.  I hope the 10-year old has recovered Ok.  https://www.google.com/search?q=English+mastiff&rlz=1T4GGHP_enUS595US595&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwj4s5v-4dTVAhVE9GMKHaTHCJAQiR4ItwE&biw=1280&bih=509