We used to keep our last dog on a run and it seemed to make the dog wild during the times we let her off the run, so I don't really like them. We have almost 12 acres and our dog never leaves the yard. The problem is now she decided to chase our chickens. Up to today she'd just play with them and we have tried everything to stop her, but just now she killed one. I am at wits end with this mutt. We had a St Bernard we gave away 3 months ago due to her killing a chicken and now this one. This dog is a German Sheperd we have had since a pup and she is 18 months. Anyhow any advice? Is it worth it to put her on a run or should we get rid of her?