I had the exact same reaction as GP. :) So there was something about how the point was hidden, TFA could benefit greatly from including your one line summary.

I wondered about if the requirement to not work contributes to an early decline in dogs? Physical fitness is seemingly the number one marker for longevity in humans. If today's pets get but a fraction of the exercise dogs are originally capable of, something will have to give? (Forgive me for being naive).