Frank, I am sorry to hear about you having to lose your faithful family dog today. I remember taking my 15 year old German Sheperd/Siberean Husky to the vet a few years ago because she suddenly loss the use of her back legs and was in severe pain. I remember how scared she was and the vets reassured me that what I was doing was the best. I spent a lot of my single years doing all kind of outdoor activities with my dog and I still miss that to this day. Just know that you gave Diamond a wonderful life to live as a dog.
Sounds like Diamond had a bit of "the call of the wild" in her just like my Kelsy did. I can still vividly recall the hunting instinct when encountering Nutria, Ferrets, Squirrels, Marmots, Porcupine (Kelsy lost) and an Elk herd.