Hi, I'm new to the forum and apologise for dragging up old posts but did you resolve?

I'm having the same problem. My GSD is 15 weeks today and since we've had her she's barked at other dogs. It didn't help that at her socialisation party, she was hiding under a bench when she was bowled over by an overenthusiastic puppy, who went on to get really excited, pin her in the corner and she went for him and then a couple of weeks later (after going to our local breed club a couple of times and eventually coming around to be able to sniff other dogs - they can't approach her) she was assaulted by an offlead dog which came out of nowhere from behind us - thankfully no injuries but took her way back in her socialisation and back to her fear of getting in the car etc.

Now it's people she's started barking at and as you said, it's so embarrassing! I don't know why she barks. I'm not a dog expert so have no idea if this is fear, play, aggresssion or what. She starts her KCGC training this week so I'm hoping that will help but she goes out with me and mostly she is fine. Then a week or so ago she started barking at people. The only person to approach us, she jumped up for a fuss (I'd normally discourage this but it was too late) but this person had kids with him and she was barking at them which scared the hell out of them. I had two men cross the road and a mouthful off another last night. It's not fun. I've tried to make her sit and I stand in front to break eye contact but she tries to look around my legs - her hackles raised but that could still be play right? - i've tried saying "enough" in a deep quiet voice, also "no", "leave it" and "ah-ah" which are all commands she normally responds to.

I've heard sitting outside a supermarket or similar with lots of people can help but I don't think Asda would appreciate me sitting outside scaring off its customers!

Any advice would be really appreciated.