my 7.5 old, Gus has met my daughter & hubby numerous times, they came to the front screen door the other day, un announced, Gus saw them & growled, first time he has growled (apart from at a kite surfers kite), i have no doubt he will be fine, i have had extensive experince with BM's in the past, Rotties, etc i dont want a dog to savage everyone or bark at the gate all day, these are nurotic dogs, if that is what a guard dog is, then its not for me, Gus lays around, of course he does, he is content in his enviroment, but with love & affection i can guarantee that when & if needed he will step up. these people with so called "guard" dogs that bag other breeds need to research befor opening there uneducated mouths, I can make any dog savage, not that hard. wake up idiot. Maybe they are using theirs as penis extensions.