13 is great for a GSD! Congrats. They are the best, obviously I am biased. I hope Hemi lasts for 13, she is my constant companion. I swear she can read my mind.
I agree that GSDs are fabulous. Never was a shepherd guy til this one. Without question the best critter I've been owned by. Vet seemed to think she's still got a couple more years in her. I hope he's right. 13 is pretty rare for shepherds..