This was many years ago, but I believe mine was 13 when she passed. She had papers but I bought her at a small pet shop (I was young and naive). I remember visiting her and her supposed sister twice. She had a funny walk and was a little sick as I recall. Something just wasn't perfect about her.
On the second visit, it kinda hit me that I wasn't buying a car or something I should expect to be "perfect" but rather was gaining a companion, and that everybody (and dog) needs a loving owner.
We had a long trip home and I had her in a box on the front seat. Some idiot cut me off, and when I hit the brakes, she tumbled out. She then climbed into my lap, and fell asleep the rest of the car ride home.
Best dog ever. Only one I've ever had. Sorry to get sappy, lol.