My 2 year old cocker spaniel just goes crazy when she sees something or someone out of place. e.g. yesterday she saw someone in the backyard that backs on to ours. She ran under the fence and proceeded to stand about 10 feet away and bark like crazy at him. I could not call her off no matter what I said and I couldn't get over the fence. I even went and got her ball which normally would have her come. She just gets totally focused. I eventually had to go around the street and approach that way. She had worked her self into a frenzy. I'm afraid someone will go after her if they could catch her of course. She is a tiny female with an attitude. I would appreciate some advice on how to call her off.