Hi folks, I hope you can offer some advice here as i am getting quite exasperated by my one-year-old German Shepherd female (working breed). I don't have an enclosed doggy park nearby and so never felt confident enough to allow my pup off-lead. The thing is that when she's on-lead, she gets extremely frustrated when dogs walk past her without saying hello but I find other dog owners don't want their dogs mixing with such a big dog and so the frustration gets too much and she snarls, barks etc in an awful aggressive-looking way. I am sure she could be weaned out of this behaviour if she could meet them her way for a while in an off-lead area, free of the connection with me, but I am very wary of her perhaps wanting to chase smaller dogs. She's been to obedience classes but when she sees other dogs she doesn't even know I exist, she gets so excited. I don't think she is aggressive but am concerned that she may be if it continues like this. I am now considering putting a sheepdog muzzle on her for her first solo at the doggy park but still I'm cautious. Am I being TOO careful? I would not like to let her loose then find I've caused more problems.