If you can't handle your dog it could kill a human, I'm not concerned with the yappy dog.If a little yappy dog starts annoying my dog, my dog has the right to attack it.
There is no point having gaurd dogs that are not capable of taking on a human being intent on doing you harm.
My dogs are outside right this second fending off the property I watch yelling at some prostitutes and drug dealers. This goes on almost every night from around 10 PM till 4 in the morning. Happens probably a dozen times on average.
OK gotta go out and see what the comotion is all about again... I'll catch up on my Z's in the afternoon as usual.
Do you have control over your dog? Trained guard dogs are controllable.