Why Does My Dog Eat Grass? (And Should I Be Worried?)

"Why do dogs eat grass?" is tied for the #1 most Googled dog question in the world — getting 82,000 searches every single month. If you've ever watched your dog enthusiastically mowing the lawn and wondered what on earth is going on, you're in very good company.

The short answer: it's usually normal. But the fuller answer is more interesting — and there are situations where it warrants attention.

Why Dogs Eat Grass: The Main Theories

1. Instinct and Ancestral Behavior

Wild dogs and wolves eat grass and plant matter naturally as part of their diet. Grass and plant material have been found in the stomach contents of wild canines worldwide. It's possible that domestic dogs are simply following a deeply embedded instinct, regardless of whether they actually need to.

2. Digestive Relief

The most popular theory — and partially supported by observation — is that dogs eat grass to trigger vomiting when they have an upset stomach. Grass is not easily digestible and the blades can irritate the stomach lining, prompting vomiting. Some dogs appear to deliberately seek out grass when they feel unwell.

However, studies show that less than 25% of grass-eating dogs actually vomit afterward, and most don't appear ill before eating it. So while digestive relief may explain some grass-eating, it doesn't explain most of it.

3. They Simply Like It

Especially in spring and early summer, fresh green grass is tender, moist, and apparently quite tasty to many dogs. Many dogs show no signs of illness before or after eating grass — they're just having a snack they enjoy.

4. Nutritional Deficiency

Some vets suggest dogs may seek out grass when their diet is lacking in fiber or certain micronutrients. Grass is high in fiber, and a dog whose diet is mostly protein and fat may instinctively seek plant matter to fill nutritional gaps.

5. Boredom and Attention

Some dogs eat grass simply because there's nothing else interesting happening. It's stimulating, it's tactile, and if it gets a reaction from you (running over, saying "no!") — even better.

When Should You Be Concerned?

Grass-eating becomes a concern in these situations:

• Eating large amounts obsessively — may indicate significant digestive distress
• Eating grass treated with pesticides or herbicides — toxic and dangerous
• Accompanied by other symptoms — lethargy, loss of appetite, diarrhea, bloating
• Compulsive behavior — unable to stop or be redirected, eating non-food items

If your dog is frantically eating grass and vomiting repeatedly, that's a vet call.

What To Do About It

For most casual grass-eaters, no intervention is needed. But if you want to reduce the behavior:

• Ensure their diet includes adequate fiber — some high-quality foods contain sweet potato, pumpkin, or beet pulp for this reason
• Increase mental stimulation and enrichment — bored dogs find things to do
• Redirect with a toy or activity when they head for the grass

Keep Their Mind Busy Instead

A dog whose brain is engaged during the day is less likely to find entertainment in your lawn. Enrichment tools like our Duck Slow Feeder Bowl provide mental stimulation during mealtime that reduces boredom-driven behaviors throughout the day.

Built for the dogs who run the house. 🐾