7 Mo. Rottie lunges, growls and bites me at random- so confused
I'm in need of some serious help. My 7 Mo. Rottie lunges, growls and bites me at random. We have had her since she was 9 weeks old. At first we thought this activity was because she was just a puppy and needed teaching but it has not stopped, in fact she is well on her way to weighing 70 pounds and is large now. We have worked with a behaviorist, used a shock collar, manual methods of restraint such a pulling up on her collar into a sit, positive reinforcement, proper negative reinforcement to no avail. She does this at random. Sometimes we can see that she is getting stirred up when she is stimulated such as playing but it ends up with someone getting hurt. She can all of a sudden start attacking her leash on a walk, then lunging up and biting me. One day I just walked out the back door and she ran to me, growled, jumped on and started biting me. She is very powerful and when she does this it hurts, brusies and seriously scares us. We are embarrassed and worried as our neighbors can see what she does and it is really bad to watch. She does not limit these actions to just me, she is this way with my husband and my 9 year old daughter. This is scaring me and my family so very much. I have worked so hard, been committed and am at the end of my rope. I want to love her more but I'm so confused. Can you please help?