The vomiting caused by Teddy eating grass may be caused by gastrointestinal discomfort, stimulation of the vomiting center, or poisoning. First, make sure whether the grass has been sprayed with pesticides to avoid food poisoning in dogs. If there is no poisoning, there will be no problem. Just help the dog regulate his stomach. Dogs eat grass generally because their bodies lack trace elements, so they need to supplement trace elements. You can occasionally give your dog some fruits or vegetables.