Hi. I have a very strange problem with my 7 month old boxer, Sandy. I had her since she was 2 months old, and she has been adorable, bundle of joy for the past few months. She's a very quick learner, and I've had no problem training her with everything from house-breaking, simple commands, etc etc.. One enormous thing that I was proud of was that she would relieve herself by herself if she was let out on the yard. She would go out on command, of if she had to go, and she would return on command when she was done. Everything was so great.. Until few days ago..... Problem started when I let her play loose for the first time at a local park. We had great time and she listened to every one of my commands, so we had a blast playing in the park. That same night, she was whinning to go out to pee, so I've let her out to do her business. Normally, she would come in by herself within few minutes, but she would not come in after 5 minutes, so I called on her to come inside. She would not only not listen to my commands, but she started to bark at me(She has never barked at anything before this) and run around furiously around the yard. It took me a full hour to get her inside the house, and consequently, I was furious at her. I didn't punsih her though, because she walked in on her own (after an hour), and if I punished her for that, she would assume that coming in by herself was the cause for her punishment. I assumed that it was a one time behavior, so I let her do her business as usual the next day, and same thing happened. She would bark loudly, even growl, and would run around the yard as if she was challenging me. Even stranger still, she would bark on every command that I would give her (Sit, stay, or come) From that point on, when she has to go out, I would walk her on a leash. This has made me very bad, because I wanted to train her in a way where she would be free and at the same time respect me and listen to my commands. I'm sure Sandy is not well off either, because she has to wear a leash now, which she didn't need before. I know this was a very long message, but I sincerely hope that someone could help me out with this issue. please Help!