Barking and Chasing Behavior

[ernstlaurie]

Can anyone recommend a good book for training? I have a 4 year old bouv who is barking and chasing children as they enter my yard. Last night a neighborhood boy ran through our yard and my dog nipped him hard - it was not aggressive - more like the nipping you see in herding. It did not break the skin, but scared the poor kid. I have to get a hold of this behavior - any suggestions, please help