Twiggy went to cancer in her 10th year.
Before that Tinkerbell, Tippytoe and Scooter were each about 16, 15 and 13 respectively when my parents put them down because the new dog didn't like them. They did it when I was away planting on the farm that spring. Each of them had some good years ahead of them and they got rid of the dog a couple of years later anyhow. That really made me mad.