I have a black lab. No a 'pointing' lab by pedigree, but she does point quite often. She would SHRED you if you broke in, or even if you were in the house and made someone that lives here scared it would be game over for you. She is VERY protective and very in 'tune' with the family, as have been most of the female labs I have been around.
IMO the protective part is handled by raising them as part of the family and not as a pet. Pack behavior in dogs is not something that comes and goes but something ingrained in their makeup, they just have to be part of your 'pack'.