What is the purpose of Guard dog training. As for obedience it is a must and should have been started much earlier. I personally prefer if the owner did the training themselves, may be in the presence of a dog training if required. This is a good way of owner and odg bonding. When training take dogs away, dog knows how and which means they use to train dogs. I do not like breaking the spirit of the dog or a horse. Nor should one use force. If your dog is going to be staying with family inside the house then you have to be careful regarding guard dog training as certain words means doing something or a particular action which can hurt someone. This word may be said unknowingly my you or even a child. hence I asked in the begining the purpose of guard training. These are breeds where guarding ones family and property comes naturally and does not need to be hightened specailly if you are not a proffessional.
At the most teach your pup speak which meaning barking and that command is enough to scare most people away. Although it may be a bit late to teach it.
I cannot and will not comment on other companies or people who train dogs as a proffession. Nor do I know them.