Some days, for every step forward, you take two steps back. Went to a nearby park with Oscar today. I let him off leash to work on his whistle training and he took off. He ran completely out of the park, down two blocks and crossed two streets before I was able to catch him. It was a miracle he wasn't run over. It was all I could do to not strangle him once I managed to grab him. I wish I knew why he's so good most days and totally out of control on others. Very frustrating.