Rare breeds come with a separate package of does and donts. I do protection work with my lgds and COMMANDS do work. I have a CAS working with a MAL PP trainer in Florida , he uses the Mals for PP and sport and the CAS at home to protect his family. CAS require more socialization then obedience training, working lines bred to work with livestock are NOT dog aggressive. They work in packs and do well as a team. They need some property to mature into healthy adults so not good recommendation for small yards or apartments. They also shed once a year badly, they bark allot at nite, and they dig holes the size of trenches, they will defend and it could be a new uPS guy who comes into the wrong yard. They do NOT do well in humdity kept outside. I wont post pics of the dogs working as lGDS, as family dogs , doing PP work, passing CGC TDI ATTS and bite work. Im not here to PROMO them. But to make sure they are not lumped in with dog aggression or not be able to be turned off and on . Since you are adding more dogs it is best to get all the other dogs you want first and add the guard dog be it lGD or mastiff last. Because many will accept leadership from other dogs in the home easier then accepting newbies who may wish to assert a higher role in the pack.