11/06/2026
Every dog owner has seen it. Dog walks past a patch of grass, stops, starts eating with apparent enthusiasm, and you immediately wonder if something is wrong.
Almost certainly nothing is.
The widespread belief that dogs eat grass to induce vomiting β and that grass-eating means a sick dog β was tested properly in a study published in Applied Animal Behaviour Science. Researchers surveyed the owners of over 1,500 dogs about grass-eating frequency, pre-eating behavior, and post-eating vomiting. The results were clear: fewer than 10% of dogs showed signs of illness before eating grass, and only about 22% vomited afterward.
The vast majority of dogs eat grass for entirely mundane reasons.
Dogs evolved as omnivores over thousands of years of living alongside and scavenging from humans. Their wild ancestors ate plant matter regularly β seeds, fruits, and yes, grasses. The behavior is instinctive and persistent regardless of how complete their commercial diet is.
Grass also provides insoluble fiber that commercial dry kibble is often low in. Fiber supports gut motility β the movement of food through the digestive system β and some dogs appear to self-regulate by eating grass when their digestion needs a push.
Some dogs also appear to genuinely enjoy it, particularly young, tender spring and summer grass. They're not solving a problem. They just like the taste.
When should you actually be concerned? If your dog is eating grass obsessively, more than usual, with obvious distress or repeated vomiting β that pattern warrants a vet visit. If it's occasional, relaxed, and followed by zero drama β let them graze. They've been doing it longer than we've been watching.