Why Do Dogs Eat Grass?
If you've ever looked out into your yard and seen your dog chomping away on grass like a goat, you're not alone, and you might wonder, "Is that normal?" The short answer: sometimes, yes. But not always.
Let’s discuss the reasons behind grass-eating behavior in dogs, when it might signal a health issue, and what you should do about it.
Is It Normal for Dogs to Eat Grass?
Many dogs occasionally nibble on grass, and for some, it’s just a quirky habit. Others may do it more persistently, especially when they’re not feeling well.
One of the most common causes of grass-eating is gastrointestinal (GI) upset. Dogs that feel nauseated may instinctively eat grass or plants, which often leads to vomiting. Vomiting can temporarily relieve nausea, and many dogs seem to feel better afterward. If this sounds like your pup, treating the underlying cause of nausea with vet-recommended medications, fluid therapy, or dietary changes often stops the behavior. It’s important to consult with your vet prior to giving any over-the-counter medications, since some can be dangerous to dogs.
Bilious Vomiting Syndrome - Cause or Effect?
Small dogs, in particular, are prone to a condition known as bilious vomiting syndrome. This happens when the stomach is empty for too long (like overnight) and stomach acid builds up. These dogs may wake up, go outside, eat grass, and then vomit a mixture of bile, foam, and grass.
The good news? It’s usually an easy fix. Feeding smaller meals more frequently or giving a small snack before bedtime can help prevent early morning tummy troubles.
Not Sick, Just Bored?
If your dog isn’t showing any other signs of illness, they may just be eating grass because... well, they’re bored or hungry. Left to their own devices in the yard, dogs find ways to entertain themselves. Some dig, some bark, some chase wildlife, some roll in stinky stuff, and some snack on grass.
I once glanced outside and thought my dog was covered in blood—only to find out she'd been rolling in some disgustingly squishy, overripe garden tomatoes. There’s never a dull day with pets!
Is It Bad for Dogs to Eat Grass?
While occasional grazing isn’t usually a big deal, there are some risks:
Pesticides or fertilizers – Chemically treated lawns can be toxic.
Poisonous plants – Some plants are harmful to dogs. Check this list from the ASPCA or a plant identifying app if you're unsure what plants in your yard might be dangerous.
Parasites and germs – Grass in public spaces can carry intestinal parasite eggs or infectious bacteria.
Cleanup duty – Many dogs vomit after eating grass... and it’s usually somewhere inconvenient (like your rug).
When Should You Be Concerned?
Grass-eating can be totally harmless, but it's worth a closer look if:
It’s a new or sudden behavior
It’s happening frequently or compulsively
Your dog also shows signs of illness (vomiting, diarrhea, lethargy, weight loss, or decreased appetite)
You suspect your dog may have eaten a toxic plant
What Should I Do If My Dog Keeps Eating Grass?
If your dog eats grass occasionally and shows no signs of illness, it’s probably harmless. But if the behavior is frequent, or you notice other symptoms, a vet visit is the best next step.
Your vet may recommend:
Dietary adjustments
Medication to manage nausea or acid reflux
A change in feeding schedule (especially if vomiting happens after long fasts)
Diagnostics like blood work, x-rays, ultrasound or stool testing to check for deeper issues
Final Thoughts
Some dogs just enjoy munching on grass, and in healthy, well-monitored dogs on parasite prevention, it’s often nothing to worry about. Still, it’s always a good idea to bring it up at your dog’s next veterinary visit, especially if it’s a new behavior or paired with other signs of GI trouble.
If you’re ever unsure, your vet is your best resource for figuring out whether your pup’s salad-snacking is harmless—or a sign of something more.
