This dog was likely a stray that got dumped out in the country and then hit by a car and left for dead on the highway out in front of a huge vineyard on my route.
One of the vineyard workers found her and took her to the vet, who wound up having to amputate her leg. She was then "adopted" by the farm workers and spends her days running free on a 500 acre vineyard/winery. Despite the loss of the leg, this gal is one of the FASTEST dogs I have ever seen. She lives to chase the ball. When I pull in there for their daily pickup, she hears my truck and will literally come hauling ass from half a mile away in order to take a flying leap into the truck and get her biscuit. No joke, I was delivering there for weeks before I even noticed that she only had 3 legs. If you pick up her ball and start throwing it, you will wear your arm out before she gets tired. Its amazing how adaptable dogs can be.