My young dog Zena is normally well behaved and listens to me in the house but when we go into the garden and she is running about or just lying in the grass and I call her to come sometimes she just ignores me or she comes. If she is playing with a toy or has something in her mouth that she shouldn't i.e. a stone and I want her to come she runs in the opposite direction. Does anyone have any tips for me as to how I can remedy this problem. Thanks.