Have to mostly agree with indigo. Humans stomach, teeth structure, and gut ecology is not designed to eat much grass. Maybe a little here and there if it is juiced and cooked and the hard to digest cell walls are broken down. Its only nutrition if we can utilize the nutrients.
Fresh Dandelions are a good bittter than can stimulate bile as well. My dog ate some of my kids poo in the backyard last summer. My 3 year old thought it was cute to poo outside. We wondered why our dogs breath was smelling like poo, when finally we caught our 3 year old going in the corner outside. The ole lady was pretty grossed out. The dog survived :)