Im sorry to hear this very sad story, at least they were together, and can run free now, no fear of nasty cars, or unlocked gates... ;)
some people seem to have a problem having a dog until old age, its a worry....
My thoughts are with you, and we know that Mr.Whippy, and Misty are now healed, and waiting for you at the fabulous RAINBOW BRIDGE. :D
All my best wishes,
Mandz.xx