I know this is normal behavior. I have owned dogs all of my life. Ripley is the only dog, though, that I have ever had who seems to do this somewhat regularly. I would say at least once every two weeks he will go outside and eat grass and throw up out there. Sometimes it is as often as weekly. He is definitely not a food driven dog and sometimes even turns up his nose at treats. There are days, however, that he can really *pack it away.*

Bella has never, in the five years that I have had her, eaten grass. She has only thrown up twice in five years that I am aware of. I don't remember any of my other dogs eating grass sort of regularly.