grass.
"Is it just me or has the grass has gone bad?" Photo: Kettukusu/Flickr A: In a recent question to Paw Nation, a user asked me if dogs eat grass to settle their stomachs or, since her dog often throws up after eating the green stuff, if it's the grass that actually upsets their stomachs. But first let's answer the question, why do dogs and cats eat grass? Some dogs and cats inherited their taste for grass from their ancestors, others chomp it just to have something to do, and some do indeed munch on grass to settle an upset stomach or another gastrointestinal-related problem. Eating grass will often cause vomiting, sometimes because the grass itself upsets your dog's or cat's ...