A Chow/Border Collie mix should live between 12 and 15 years. With mixed breed dogs, one can arrive at a reasonable estimation of life expectancy by averaging the anticipated life spans of the respective breeds.
The Chow has a lifespan between 12 and 15 years, which is fairly high for a dog that can weigh up to 70 pounds. The anticipated lifespan of the Border Collie is also 12 to 15 years, which is not uncommon for a smaller breed. One can also expect a mixed breed dog to live slightly longer because they generally enjoy better health. A female dog typically outlives a male of the same breed or mix.
Both dogs are active, working breeds that thrive and survive longer with sufficient exercise.