I've heard all the stories about why they eat grass, wormy, upset stomach, tryin to make themselves throw up, etc. etc. But when it comes down to it they are just dogs and sometimes a dog just wants to chew on something , like grass.. I had 3 pups show bayed on the garmin about a year ago and I thought oh yeah the pups done got em one. I got to them and they were all 3 standing in the middle of a big nice food plot grazing. And they all get wormed regular and are fed some good dog food.. They just dogs..
Might want to check you dogs for hooves. lol