Always sad to hear of a good dog gone. I'd hope that you can find a pup for both you & your bride, soon. Pups don't replace old dogs nor their fond memories, but they have an uncanny way of occupying the present and lessening the silence of the absent.
Perhaps little consolation at present, but I doubt you could have changed the outcome. Some dogs just don't get that many years and that can be and is sometimes counter to the breed's norm. I've been there, more than once. Cancer one time, renal [kidney] failure another and what the lab could only term 'an anomoly' another, and that was after an extensive autopsy.
Nothing easy about losing a friend & companion, ever.
Most sorry for your loss.
