Wyatt Earp speaking of Doc Holliday. Doc Holliday's father, Henry B. Holliday was a trained pharmacist who served in several wars, including the Cherokee Indian War, the Mexican War, and as a Major in the Confederate Army.
Dogs frequently eat grass to ease stomach discomfort. If your dog's stomach is empty, the grass may cause your dog's stomach to produce more digestive enzymes, and this can result in vomiting bile. Unless your grass is treated with fertilizer or pesticides, it's generally safe to allow your dog to continue eating it, as it can help ease her stomach problems.
Bloat is a potentially life-threatening cause of white foam vomit in dogs. Global Span states that bloat is the second leading killer in dogs after cancer. Also known as gastric dilatation-volvulus, bloat occurs from an abnormal accumulation of air, fluid and/or foam in the stomach.