You must have been so angry, riapnesh. And worried, too. I would be torn between sheer fury and absolute worry for this poor dog. People like this should never have dogs. On the one hand are those who keep dogs like staffies and bull terriers, feeding them on a diet of leftovers, beer and takeaways, with no training, and allow them to wander free to indimidate people. And on the other hand are people like this who just need to be shot. I mean, the lady you spoke to knew him, and that's all well and good, but I wouldn't like to meet any dog while alone walking with mine, let alone a GSD.
Sadly, I know people who adopt a similarly cavalier approach to dog ownership. And if i could take their dogs from them in the night and give them to somebody who damn well cared about their pets then I would.
Lisa x