Why Does My Dog Eat Grass?
Watch any group of dogs in a park long enough and you'll see it: a perfectly healthy dog grazing like a small cow. Grass-eating is one of the most commonly reported behaviors in domestic dogs, and for most owners it prompts the same two questions — is something wrong, and should I stop it?
The short answer: it's usually normal
Most veterinary behaviorists consider grass-eating a normal dog behavior rather than a symptom. In surveys of dog owners, the large majority of grass-eating dogs showed no signs of illness beforehand, and most don't vomit afterward — which undercuts the popular theory that dogs eat grass specifically to make themselves throw up.
The leading explanations
- They like it. Fresh grass, especially in spring, is sweet and fibrous. Some dogs simply enjoy the taste and texture.
- Fiber. Grass adds roughage, and some dogs may seek it out when their diet is low in fiber. A few small case reports describe grass-eating that stopped after a switch to a higher-fiber food.
- Instinct. Wild canids eat plant matter regularly, both directly and through the stomach contents of prey. Grazing may simply be inherited behavior with no modern job to do.
- Boredom. Dogs left alone in a yard often graze more. More exercise and enrichment frequently reduces it.
When to check with your vet
Occasional grazing is nothing to worry about. Talk to your veterinarian if the behavior changes suddenly — a dog that starts eating grass frantically, eats much more than usual, seems lethargic, or repeatedly vomits should be examined. And regardless of why your dog grazes, keep them off lawns recently treated with fertilizers, herbicides, or pesticides, which are a genuine hazard.
Otherwise? Let them have their salad.