Maggie has been eating grass like a cow...just mowing down the field like crazy. Then she gags and throws up. The throw up is like foam, but a bunch of it with a little bit of grass in it. This all started the day after I gave her the rawhide and she threw that up. Don't know if it has had anything to do with it or not. She eats just fine, plays fine, and acts normal other than when she is not playing she is mowing the lawn! And we live on 90 acres. She did this last year also. Any suggestions?