Hello all. I'm new to the forum. Our English Mastiff Zeus will be 3 in august. How can I train him to stop barking at guests and to warm up to them if I tell him it's ok? I like the initial bark because my husband is in the Army and away from home a lot. Also, he's not aggressive barking, he's afraid. If the guest takes any step toward him, he jumps back and runs away. We've also had a problem with the neighbors kids. He barks at them from the end of his lead when he goes poty outside, so when I lead the kids to Zeus and show them to put their hand down and let him sniff, etc, he warms up right away but then jumps left and right (excitedly) and barks to play- this scares the kids really bad because he's 150lbs and has a loud bark! HELP!