I don't think the solution to the problem is for the 'good' people to abandon the parks (although that is what we have chosen to do, for our dog's safety). The solution is for us to stand up, together, and publicly shame the people whose dogs are aggressive into leaving.
The last time I went to the park this large scared GSD went after three or small dogs in the park and the small dog owners did nothing. He could have killed someone's dog, so even though it didn't attack my dog, I approached him and told him that his dog was not appropriate for the park. He was nasty and condescending, saying things like, 'lady, you just don't understand dogs, he is just very confident and alpha'. I explained to him that I did in fact understand dogs, and that a confident dog didn't attack other dogs. He turned away and ignored me. There were probably 50 men and women there in addition to me, all of whom were obviously scared for their dogs, but none of them would stand up, or back me. So I said to him (major bluff here), "fine, if your dog attacks my dog, I will give him the command to kill your dog, while you are carrying it's body out of here, don't cry to the other people here, they don't want you here either, and you have been warned." I also told him that since he knew so much about dogs, he surely knew what schutzund training was, and that my dog was trained extensively in this kind of attack.
I was PRAYING while I was saying all this that my dog would stay in the 'down stay' position I had put him in before approaching the guy. HE DID!!!! Puppy kindygarten paid off big time!
We won't be going back to the park, it's just too stressfull for mama.
