It’s good for them, as it is for many species
It’s easy to feel sorry for this Bulldog when it looks like he falls and rolls down a grassy hill. Within 30 seconds, though, he has twice gone back up the hill and rolled down again. Clearly, he is playing, and having a great time at it.
Many animals engage in play seemingly just for fun, and dogs are arguably the champions, spending huge amounts of time engaged in play. The playful activities that dogs do for the sake of a good time include wrestling, chasing, fetching, tugging, rolling, leaping and pouncing.
via Whisker Therapy