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"I could use some help with an emerging problem with my 9 month old blue heeler mix. Scrabbles is a rescue dog I have had for 4 months. She was fearful of everything when I first got her, especially men. Once she learned to return to me when called, I began to take her to the park every day and let her run about or chase a ball for about an hour. She is great with dogs and is growing increasingly comfortable with people, letting them pet her on occasion without pulling away. Kids have been at the park before but she usually avoids them or barks once or twice then goes the opposite direction. Recently she has been getting more vocal with the barking and I usually call her away to another part of the park. Then one day, shortly after I let her off the leash, she suddenly began chasing a little boy, circling him, and barking ferociously. I gather from the circling that she was attempting to herd him but it was uncomfortably aggressive and she attempted to nip him when she was close. The boy, thankfully, was remarkably calm. I eventually leashed Scrabbles and he offered to walk her so I let him walk next to me while I walked her. Scrabbles seemed ok but after a couple of minutes stopped walking straight ahead and headed toward the boy again and not in a friendly way. So I just took her home. What can we do to reverse this emerging pattern of behavior, especially if I don't have or know kids who can interact with her? Is her behavior leading to biting a child? "