If you'll accept condolences and sympathy from a noob, you got 'em from clear out in the Rockies.
Had a boxer/bull mastiff mix that was the goofiest, gentlest, and strongest dog I've ever known. Found him running around stray in Chicago one Christmas Eve, and we always hoped we managed to balance the hardship of his earlier life with the good years he had with us. The vet figured he was maybe 5-y-o when we found him, 6 years later he developed lymphoma and it got bad fast, maybe a month. My heart goes out to you, they're family.