If you’ve noticed your dog eating grass, whether in the backyard or on walks, you’re not alone. Grass-eating is common in dogs and is often completely normal. But in some cases, it can be a sign of an upset stomach, boredom, or an underlying health issue. Here’s how to tell the difference, what it means when your dog keeps eating grass, and when it’s time to visit the emergency vet.

Why do dogs eat grass?

If you’re wondering “Why does my dog keep eating grass?” you’re not alone. This behavior is extremely common and many patients ask us this question. Dogs may munch on grass for many different reasons, and most of them are harmless. Here are the top causes, from completely normal instincts to signs your dog may need a vet visit.

Normal reasons why dogs eat grass

1. Normal Foraging Instincts

   Many dogs graze and eat grass simply because it’s instinctive. Exploring the environment with their nose and mouths is normal canine behavior and usually nothing to worry about.
   

2. Taste or Texture
   

   Some dogs genuinely enjoy the flavor or crunch of fresh grass. If your dog eats grass calmly and without other symptoms, like vomiting, foaming or diarrhea, this is likely the reason.
   

3. Digestive Needs

   
   

   Eating grass can help dogs get the fiber they need in their diet, which can help with digestion. A dog eating grass is sometimes related to relieving an upset stomach. While this may be a smart self-treatment strategy, it’s still important to consult with VEG if your dog is vomiting to understand the underlying cause of their discomfort.
   

4. Boredom or Stress Relief

If dogs don’t get enough exercise or mental stimulation, they may resort to chewing on grass to keep themselves occupied or relieve anxiety. That’s why it’s important to monitor your pup’s behavior and provide adequate exercise and enrichment activities to keep their minds busy, which we’ll explore a little further down the blog.

Believe it or not, a dog might be eating grass out of simple boredom. However, it's important to get veterinary advice if your dog is eats grass to make sure there's no underlying problem.

Signs that your dog's grass eating might require medical attention

If your dog is showcasing any of the behaviors above, it is likely that their grass eating is totally normal and does not require any medical attention. However, there are some signs to look for which may lead you to seeking medical vet attention. If you notice any of the following grass-eating behaviors or symptoms with your dog, contact your vet or emergency clinic.

1. Excessive eating of grass
   

   While chewing on grass is usually not a big deal, excessive grass eating should not be ignored. It can be a sign of gastrointestinal issues or a nutritional deficiency. So, if you notice your dog eating grass frantically, more than normal or showing signs of discomfort, give your primary care vet a call and have them take a look at your dog. And remember that your local VEG is here 24/7 in case your dog is in pain or vomiting from eating grass.
   

2. Dog eating grass and vomiting
   

   If your dog is vomiting repeatedly and is unable to keep anything down, including food and water, it could be a sign of gastritis, pancreatitis, obstruction or even a toxic ingestion. If you are concerned, call VEG right away. If there is ever blood in your dog's vomit, this is likely serious and requires emergency attention.
   

3. Dog eating grass and having diarrhea
   

   If your dog's grass-eating habit is coupled with soft stool or diarrhea that lasts longer than 24 hours, this might also be a cause for concern. We recommend you call your local VEG to speak with our veterinarian. VEG is open 24/7, call anytime.
   

4. Dog eating grass and has blood in poop

   
   

   If your dog ever has blood in their stool or poop, call a VEG emergency vet right away.
   

5. Dog eating grass and not pooping

   
   

   In some cases, your dog may be eating grass but unable to poop. This can signal that your dog is having digestive issues, as outlined above, and they are eating grass in an attempt to move along their digestion.

   
   

   However, it could also signal that there is a blockage or obstruction, which would require medical attention. If your dog appears to be in pain, becomes lethargic, begins vomiting consistently or appears nauseas, it's best to call an emergency vet to speak with a doctor.
   

   

   If your dog is eating grass and showing signs of lethargy, bring your pup in to VEG ER for Pets. Our vet hospital is open 24/7 to help diagnose and treat your pet.

6. Dog is lethargic and low energy
   

   If your dog appears to be slow, lethargic and has low energy after eating grass, it's best to call your local VEG to speak with a doctor.
   

7. Dog eating grass and licking excessively

   If your dog is eating grass and also excessively licking their lips, the floor, or anything else, it's worth contacting your local emergency vet.

When to visit an emergency vet

If your dog is eating grass excessively and displaying any of the following symptoms, seek emergency vet care.

• can't stop vomiting

• blood in vomit or poop

• dog is refusing water and or food

• dog is suddenly lethargic

• dog has excessive diarrhea

• dog is not pooping at all

• dog has trouble breathing

• dog is foaming at the mouth or licking excessively

• you think your dog may have ingested a toxin

• dog appears to be in pain

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Should I let my dog eat grass?

In most cases, it is safe to let your dog eat grass, especially if they’re otherwise healthy and not showing signs of illness. Many dogs graze occasionally out of instinct, curiosity, or boredom, and a few bites of clean, untreated grass are usually harmless.

However, grass-eating becomes a concern when your dog does it excessively, suddenly, or in combination with vomiting, not eating, or other digestive symptoms.

If you’re wondering “Should I let my dog eat grass?” the answer depends on where they’re eating it and how they’re acting while doing it.

Dog eating grass? Read on to determine if this is an emergency. Our emergency vet is a phone call away, and you never need an appointment at VEG. Walk in anytime.

Grass-eating can be dangerous for dogs if the area has:

• Pesticides or weed killers, which can be harmful or even toxic when ingested.

• Rodenticides (rat poisons) from areas treated for pests, especially in parks, apartment buildings, or city lawns.

• Toxic plants such as mushrooms, lilies, or certain weeds, which dogs can accidentally eat while grazing.

• Parasites like Giardia or roundworms can be present in grassy areas that have contaminated soil or standing water

• Foxtails are another unexpected hazard for dog owners as these sharp, barbed plant awns can embed in your dog's throat, mouth, or nose.

How to prevent your dog from eating grass

Provide a balanced diet

Your dog sure can chow down throughout the day! And making sure that your dog is eating a balanced, nutrient-filled diet can help reduce the need to seek out additional fiber or minerals from grass. Getting regular check-ups with your primary care vet can help you come up with a diet tailored specifically to your dog’s age, breed, and health condition.

Increase exercise and mental stimulation

Who loves to exercise? Your dog! Most dogs love being active, especially if their favorite human (you!) plays a part in the routine. Regular physical activity and providing mental stimulation can significantly reduce boredom or anxiety-related behaviors, like eating grass. Some great ways of engaging your pup and getting more exercise in your dog’s routine include:

• Interactive toys - dog-safe toys that squeak or move are always a hit

• Regular playtime - throw that Frisbee, ball, or stick and watch Fido have a blast retrieving it…or just staring at it. It really depends on the breed!

• Training sessions - whether it’s teaching your dog to heel or correcting some behavioral problems, a good trainer will make it a pleasant experience for your dog

Keep your dog leashed and monitored

Keeping your dog on a leash when outdoors is the best way for you to prevent your dog from eating grass. If you let your dog off-leash in your yard or at the park, keep an eye on them. Dogs often get into things they shouldn't when you're not paying attention.

Frequently asked questions

How long after eating grass will my dog vomit?

Dogs won't always vomit after eating grass, but if they do it usually happens within a few minutes to about an hour. Some dogs throw up almost immediately, while others may vomit a little later as the grass irritates the stomach lining. However, not all dogs who eat grass will vomit—many digest it with no issue at all.

If your dog vomits repeatedly, vomits blood, can’t keep water down, or continues to eat grass frantically, contact your vet or an emergency vet right away.

Should I stop my dog from eating grass?

You don’t always need to stop your dog from eating grass, as long as it’s occasional, calm grazing and the area is free of chemicals or toxic plants. Many dogs eat grass out of instinct or curiosity, and it’s usually harmless. However, you should stop your dog if the grass has been treated with pesticides or fertilizers, if they’re eating it frantically, or if they show symptoms like vomiting, diarrhea, coughing, or refusing food. In those cases, the grass-eating may be a sign of nausea or an underlying issue, and it’s best to contact your vet.

Why is my dog eating grass but not food?

When a dog eats grass but refuses their food, it usually means they’re feeling nauseous or uncomfortable. Dogs often graze to soothe an upset stomach. This behavior can also point to GI irritation, acid reflux, parasites, or occasionally a potential blockage. Because appetite loss and grass-eating is a red flag, contact your vet if your dog skips more than one meal or shows symptoms like vomiting, lethargy, or abdominal pain.

What should I give my dog if he's eating grass?

Providing your dog with a more fiber-rich diet could help if they are often eating grass. This can help improve their digestion, which might be the reason why they are eating so much grass in the first place.

VEG ER for Pets offers 24-hour emergency care for dogs

Most of the time, grass-eating is a completely normal behavior in dogs and nothing to worry about. What matters most are the symptoms that come with it, not necessarily the grass itself.

If your dog is vomiting, refusing food, acting differently, or eating grass suddenly and in large amounts, it’s worth getting them checked out. When you’re unsure whether it’s normal grazing or something more serious, our emergency vets at VEG are here 24/7, even on holidays.

Call us anytime or simply walk into any of our 120+ locations nationwide, no appointments needed. Our experienced emergency veterinarians and vet staff know just what it takes to ensure the health and safety of your dog.