Eating Grass

What is the deal with Sugar? Every time we go outdoors, she plunges into the first tall grass she can find and stands there grazing like a cow. First she licks the dew from the green blades, then she gently chews the stalks and works them around in her mouth. Her tongue sticks in and out as she tries to do something with the grass she has eaten. She looks for all the world like a fuzzy little cow with her head down snuffling grass. I thought dogs only ate grass when their stomachs were upset, but my neighbor says his dogs are doing the same thing and they have never done that before. Wonder if the lawn care people are putting some kind of flavoring on the greenery? I tug on Sugar's leash trying to get her moving, but she only wants to stand there and chew. Sigh. OK. Guess I will just have to let her have her way. It's going to be a loooooong summer.