• I'm sure we can all find isolated incidents of any breeds' attacks. I believe the Boerboel to be a mid level guard dog in temperment. The following guard dogs are high level guard dogs in temperment: Fila Brazillian Bandogge American Bandog Presa Cane Corso CO Sar there are others... The following you may take your chances if they are guarding and they don't fit part of her criteria. Neo DDB The following will most likely not get along with her Shih Tzu: Pit Bull American Bulldog English Bull Terrier there are others... Always listen to all views and ideas and don't go by just my opinions. :)