Dogs eat grass for several reasons, including a natural instinct inherited from their wolf ancestors, a need for more dietary fiber, or simply because they enjoy the taste. Contrary to popular belief, most dogs do not eat grass to induce vomiting; instead, vomiting is often an accidental byproduct of the grass irritating the stomach. If your dog is healthy and the grass is free of pesticides, occasional grazing is considered normal behavior.
For decades, the standard answer was: "My dog eats grass to make themselves throw up." However, 2026 veterinary research suggests this is rarely the case. Studies show that less than 25% of dogs vomit after grazing, and only about 10% show signs of illness beforehand. Usually, it’s the other way around—the grass itself irritates the stomach lining, leading to vomiting.
Grass is a major source of roughage. If your dog’s diet is slightly low in fiber, they may instinctively graze to help "keep things moving" through their digestive tract. This is the canine equivalent of us eating a salad to help with digestion.
Wild canids (like wolves and foxes) have been observed eating grass for centuries. Ancient dogs likely consumed the stomach contents of their prey, which often included grass and plants. Your modern dog is simply following a scavenging instinct that is thousands of years old.
Pica is a condition where dogs crave non-food items. While sometimes linked to a mineral deficiency, it is often a psychological response to boredom or anxiety. A dog left alone in a yard with nothing to do will often turn to "lawn mowing" to pass the time.
During the spring and summer, new grass is sweet and succulent. Many dogs simply enjoy the flavor and texture of fresh blades.
If you shout or chase your dog every time they nibble the lawn, they may learn that eating grass is a great way to get you to play. Even "negative" attention is still attention to a bored pup.
While grass itself isn't toxic, the environment around it can be. In 2026, we focus on three main risks:
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If you want to stop the grazing, try offering these safe, high-fiber alternatives that provide the same "crunch" without the risk of pesticides:
