We have a Shepherd mix. I love him but he needs to be watched like a hawk around any “intruders”. If people come over we basically have to put him in his kennel. It probably takes at least 5 visits by the same person before Sarge realizes they’re not a threat. He’s bitten 3 people already, luckily never breaking skin. Warning bites. If anyone broke into our house I have no doubt he would engage immediately and fight to the death.
We have a female German Shepherd and a male Rottweiler.Either one is a formidable opponent,together they are the perfect team to keep the house secure.The Shepherd is especially aggressive with strangers,the Rotterdam always looks like he wants to go to war with somebody.