wow. such a beautiful shepherd! i personally love that breed and hope to be able to have one someday.
i can relate to your having to have an animal put to sleep. it's the hardest thing to ever have to do, no matter what people say.
cherish your fondest memories of your beloved victor and maybe even picturing him healthy and happy in animal heaven will help you through the pain of losing him.
try not to think of it as "killing him" but rather you doing him a favor.
that's what has gotten me through my own experience, hope it helps you as well.