Thanks for the great information YL. I couldn't agree more with you about the chaining or penning, this was my concern frankly....I do not want to promote her displaced aggression or create a resentfulness. I thought the offer to have the pasture to romp over on my terms (dragging the tire) was a good compromise. I have no where else to put her actually...unless we were to build a kennel just for her. But I hate the idea of her being isolated. I have tried to bring her in the house, but she is obviously uncomfortable here and whines to go right back out. But I do move her around the yard on her chain so she has new things to look at and experience etc...she also plays with our other dogs when I clear the field of livestock. She gets lots of people interaction in addition to her livestock buddies. We do try to stimulate her for sure :) I have had play days with my neighbors shars, and her reaction to them is fearful aggression. So we keep arranging play dates to help her through this. I figured the better contact she has, the fear will eventually diminish. (She rides in the truck well now at least.) What my hope was and still is to try to afford an adult dog for her to be with. Not an easy task as I am finding out. No one wants to part with a good adult dog...been offered unruly or problem dogs or puppies. I am hoping some of this behavior is just normal adolescent antics, but my fear is that this is her true self emerging as she matures. I guess the recent event got me thinking her chasing is more serious than I thought...like she really means it now? Thanks again all, Kerry