One of my boys is a German Shepherd X Rottweiller and he LOVES guarding everything from toys to the front door. He has destroyd some letters in his day if I dont get to the door before him when the post comes. His instinct seems to be getting stronger the older he gets too but I love him to bits, he is super obedient in all other ways so I have learnd to live with it.
Border Terriers are well known for going walkabout on walks, Huskies too, Beagles, Cairn Terrirs are all independent on walks and some owners never let them off the lead because they have been lost before.
Spaniels and Springer Spaniels love rummaging through the undergrowth. I could go on and on but I am really just trying to say that different breeds of dog have certain behaviours and instincts, they were bred to be this way. As responsible owners it is our responsibility to research the breed we want and
make sure that they will fit in with our lfestyle.
A high energy dog like a Staffie will probably be naughty in a home where they get no exercise or mental stimulation, same with a Border Collie. All those poor Huskies put into rescue because they were cute puppies but became impossible to handle when they grew up !!!! This would not happen if they had been sold to the correct type of owner.
Hunting dogs are seldom vicious, they are trained to flush game and then call the owner or bring the prey back to the owner undamaged. So I dont think that dogs have an inherent bloodlust, most animals don't apart from carnivores who hunt for survival and then it is only for food not for fun