Hi, I was online searching for a solution for my 4 month old German Shepherd, when I came across your thread. Did you ever find a solution for your pup? I'm having the same problem with aggressive barking at joggers and cars. She is only doing this at home or when I take her walking. It is starting to make me a little fearful. I've enrolled in puppy classes and I'm hoping this will help. If you have any suggestions I would greatly appreciate it!