I have a 4 yr old male dog he is a mastiff and st bernard mix. I also have a bulldog puppy but I'm not talking about him. I want to know how i can get my mastiff and st bernard mix (Samson) to be more protective of me. When an unknown person or animal passes by our house he will bark but when they walk up he doesnt do anything he'll great them like he would me. So i was wondering how i could get him to be more protective of not just my house but also me.