Run Away Aussie!
My Australian Shepherd (14 months) is usually extremely well behaved. 98% of the time he listens, the other 2% of the time he's already run so far he cannot hear me!
I go to a small off leash park (it's basically a large field) and it was great until my dog learned that one of his buddies lives right across the street. If he sees his doggie friend outside in the yard or walking around with the owner he takes off and I can't call him back. It's getting to be really frustrating because the road gets busy, sometimes other dogs will chase him and I don't want this behavior escalating. What can I do?