No dog is best for security. Thieves know all the tricks on getting into ones property. I had 2 dogs, irrespective of breed, and both were poisoned prior to burglars gaining entry into my house and removing the safe. To gain entry into the safe they pealed the back off. Luckily for us the safe was empty of any money and documents. No loss really. The safe was found by workers some 80km away in a tapioca field, contents thrown around.