5. Isolating the dog.
If you separate the dog from the rest of the pack or family, this can also make him reserved and self-defensive. This isolation deters the dog from spending quality time with you. Hence, a bonding gap between you and the dog is created. Lack of this emotional attachment can make the dog to be on a defensive mood much of the time. Being in such mood means that any move that is suggestive of undue closeness may result into an attack.