You’ve probably rolled down a hill before in your life. You can do this with your dog, but make it challenging. Have the family and your pet try to roll back up the hill. This is great exercise. Turn it into a race!
If your dog likes to roll in grass, they probably also like to simply be near the grass. Take a walk through your tall grass next time before you cut it. You can also play this game in an open meadow. If all looks safe, toss your pup’s toys out into the grassy field and let them work to find it in the weeds.