Why Do Dogs Eat Grass?
You’re walking your dog and everything’s going fine—until they suddenly stop, lower their head, and start munching on the nearest patch of grass like it’s gourmet salad.
Is this normal? Is it safe? Should you stop them?
You're not alone in wondering. “Why does my dog eat grass?” is one of the most common questions asked by pet parents—and the answers may surprise you.
Is It Normal for Dogs to Eat Grass?
Yes, in most cases, grass-eating is completely normal behavior. According to veterinary experts, it’s a relatively common habit and not usually cause for concern—especially if your dog is otherwise healthy, eating well, and not showing signs of distress.
The Top Theories (According to Vets)
While we can’t ask dogs directly why they do it, here are the leading explanations supported by veterinary science:
It’s Instinctive
Dogs are omnivores by nature. Wild canines (like wolves and foxes) eat plants as part of their diet, especially when they consume the stomach contents of herbivorous prey. Some veterinarians believe grass-eating is a leftover instinct.
It May Aid Digestion
Some dogs eat grass when they have an upset stomach or feel nauseated. In these cases, grass may act as a natural laxative or help induce vomiting. However, most dogs who eat grass don’t actually throw up, so this theory doesn’t cover every case.
They Just Like It
Sometimes it’s as simple as this: the texture feels good, the smell is interesting, and munching on it is just satisfying. Puppies and young dogs, in particular, are known for tasting everything—including your lawn.
They’re Bored or Anxious
Behavioral vets often point out that grass eating can be a self-soothing behavior, especially in dogs that are under-stimulated, anxious, or left alone for long periods. Like tail-chasing or licking, it might be a sign your dog needs more engagement or enrichment.
When to Worry
While occasional grass-snacking is usually harmless, there are a few times you’ll want to take it seriously:
Frequent vomiting after eating grass
Compulsive or obsessive grass eating
Signs of gastrointestinal discomfort
Eating treated grass or plants with pesticides or chemicals
If your dog suddenly starts eating grass excessively or seems distressed afterward, it’s time to call your vet. There could be an underlying issue worth investigating, such as dietary deficiencies or stomach irritation.
A Word of Caution
If your lawn (or any nearby green space) has been treated with fertilizers, herbicides, or pesticides, eating grass could be dangerous. Always assume a public lawn is treated unless clearly marked otherwise.
If you allow your dog to eat grass, make sure it’s from a safe, untreated area you trust.
In most cases, grass-eating is harmless, normal behavior and not a reason to panic. Keep an eye on how often it happens, note any digestive symptoms, and be cautious about where your dog snacks.
As always, when in doubt, talk to your vet. You know your dog best—and your vet can help rule out any medical issues.
Sources:
American Kennel Club (AKC) – “Why Do Dogs Eat Grass?”
VCA Animal Hospitals – “Pica and Grass Eating in Dogs”
Cornell University College of Veterinary Medicine – Behavioral Health FAQs
