This is so true. we lost two of ours , Chevy and Daisy to this thief. It is so sudden and it happens in blink.Some day when you're feeling strong, do a search on the forum for "hemangiosarcoma" so that you can start to wrap your mind around it, and allow yourself to accept there truly was nothing anyone could have done for a different outcome. It might as well be called "GSD-cancer," and it's always terminal. I offer that because I remember second-guessing everything when we lost our first one to it -- should we have done different senior tests to have caught it early, how could the vet have missed it on her annual exam a few weeks earlier, what did we do that caused it, would a different vet have been able to treat it?....and as I read more, I realized it was probably just an inevitable outcome baked into her genetics. It allowed me some peace.
SO many of us have lost dogs to this wicked disease -- it's always sudden, jarring, and heart-wrenching. Always.
I'm so sorry for you loss. Know that we understand, because we've been there too.