I’m glad he is ok, it’s horrible and frightening when this happens but usually it doesn’t mean anything and clearly the GSD did not mean to seriously hurt Finn, or he would have done so. I’m not condoning what happened, but I’ve had dogs on the receiving end of serious attacks three times in my life and I can assure you that if it had been a true attack, poor Finn would be in a bad state now. As the others have said, try to stay calm and not be scared next time you see a big dog come up to him - easier said than done, I know!!!