We have "our round" where we walk in the nature. It is border of fields, there are trees and bushes. Our dogs have thear special place, where they always stop and eat grass, place, where they eat wild cherries (they can tear it from branhes by land), place, where they eat black raspberries, and thear favorite trees with pears. They eats pears what are in the grass. Very cheap food
. But interest is, when old dogs teach to eat it young dogs or pups.