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Barking at the front door is an especially tough situation. I understand how frustrating it can be. And it is a rather common problem among dog owners. First things first, though, relax.
Whenever you are training your dog, stay calm! Dogs feed off your energy. They can “smell” it actually. (You can learn about how dogs do this in “How Do Dogs ‘See’ With Their Noses?” ) You also want to be confident and consistent. If you give in, your dog will take advantage.
Using the OnGuard™ is relatively easy and I've laid out the steps here. You can also print this out, so you have it on hand to remind you until it becomes second nature.
Right now, your dog thinks he is in charge of defending the roost. With this training, you are claiming the area as yours. You are teaching them that you are the pack master and you are in control of the situation.
Consistency is key. Remember that your dog has probably been doing this unfavorable behavior for a while. It's become a habit, so it may take a few weeks to fully make your dog understand.