Why Do Dogs Eat Grass? Our Vet Weighs In with Answers

Why Do Dogs Eat Grass? Our Vet Weighs In with Answers

Alpha Paw Sale

Jan 15, 2024

  • Why do dogs eat grass? This can actually be a normal dog behavior, a sign of boredom, or nausea.
  • Pica in dogs is the term for eating substances that provide very little nutritional value and can include rock-eating, stick eating, or grass eating.
  • If you notice your dog eating grass, you probably don’t need to stop them unless the yard has been treated with pesticides or fertilizers, or they are eating way too much grass.
  • If your dog has vomiting or diarrhea along with grass-eating, you should contact a veterinarian.

Have you ever wondered why your dog eats grass? In this expert article, Dr. Addie explains some common reasons why your pup grazes on grass from time to time—and whether you should worry.

Why Do Dogs Eat Grass?

Pica in dogs is a term for when your dog chews and eats objects that have no nutritional value. Pica in dogs can cause dogs to eat or chew rocks, sticks, and grass. Eating rocks and sticks is a bad habit, but grass-eating is usually normal behavior. Many people believe that eating grass means that your dog is sick or trying to vomit. Actually, the most common reason for grass-eating is that it is a normal dog behavior. If you have been wondering, “why do dogs eat grass”, here are the 3 most common reasons that dogs eat grass.

1.  Eating grass can be normal.

Some dogs eat grass simply because this is considered normal canine behavior. Dogs are technically considered omnivores which means that they eat both meat and plant material. Dogs are able to digest carbohydrates in addition to proteins. Dogs are descendants of wolves, and wolves may have developed this grass-eating behavior as a way to rid their intestinal tract of parasites. This behavior may have persisted through evolution to the modern-day dog. One study found that over 75% of healthy dogs eat grass or other plant materials normally. Also, they may just eat grass because they enjoy the taste of grass!

2. Your dog may be bored.

Some dogs may just eat grass because they are bored. If your dog has not had enough exercise or physical activity, it may be boring. As a veterinarian, I see grass-eating more commonly in bored puppies. If you think your dog is bored and that is the cause for the grass eating, it may be a good idea to play fetch in the yard or go on a long walk. You can also provide puzzle toys that can provide some mental stimulation. Also, it may be a good idea to offer your pup a fun and interactive bouncy fish toy.

3. Dogs that eat grass may be nauseous.

If your dog is showing other symptoms of stomach upset such as vomiting or diarrhea, your dog may be eating grass because they are nauseous. The only time my dog eats grass is when she is feeling nauseous. Researchers at the UC Davis School of Veterinary Medicine found around 20% of dogs vomited after eating grass and other plant material. If your dog is showing signs of stomach upset including constipation, vomiting, diarrhea, or decreased appetite, you should contact a veterinarian. Your veterinarian may need to prescribe medications like metronidazole for dogs to control diarrhea and stomach upset.

Why do dogs eat grass? Our vet weighs in with answers

Top-Rated Products to Satisfy Your Dog’s Appetite

Ensure your furry friend’s overall well-being with our carefully curated selection of top-rated products designed to satisfy your dog’s appetite. From nutritious treats to interactive feeding solutions, our expert-recommended products cater to a range of canine preferences and dietary needs.

Zesty paws probiotic for dogs - probiotics for gut flora, digestive health, occasional diarrhea & bo
Zesty paws probiotic for dogs - probiotics for gut flora, digestive health, occasional diarrhea & bo
Zesty paws probiotic for dogs - probiotics for gut flora, digestive health, occasional diarrhea & bo
Our Score
  • These functional soft chew supplements feature a base of pumpkin and papaya—two sources of enzymes—plus probiotics for digestion, bowel and immune support.
  • Contains DE111, a bacillus subtilis that supports digestive function and a strong immune system.
  • These chewables contain six probiotics—DE111, Lactobacillus acidophilus, L. plantarum, L. brevis, L. fermentum and L. lactis—to promote proper gut flora and function.
  • May provide relief from occasional gastric distress, including constipation, indigestion, gas and bloating.
  • Paw-fect for small, medium and large breed dogs.
Royal canin small digestive care dry dog food, 3. 5 lb bag
  • Dry dog food specially formulated for small dogs 10 months and older weighing up to 22 lb with a sensitive stomach.
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  • Supports digestive health with highly digestible proteins.
  • Perfect complement to Royal Canin Wet Dog Food formulas.
Purina pro plan veterinary supplements fortiflora dog probiotic supplement, canine nutritional suppl
  • This veterinarian-recommended dog probiotic helps support digestive health and manage the symptoms of diarrhea.
  • Recommended for the dietary management of puppies and adult dogs with diarrhea.


Be prepared the next time your dog has an upset stomach by keeping Purina Pro Plan Veterinary Supplements FortiFlora Dog Probiotic Supplement close at hand. Designed to manage the symptoms of dog diarrhea, this digestive care dog food powder supplement contains special probiotics for dogs, plus healthy antioxidants for added immune support. FortiFlora dog digestive health supplements supply dogs with a guaranteed level of live microorganisms to benefit beneficial intestinal microflora and help quell a variety of digestive issues. A proprietary microencapsulation process helps enhance the stability of the probiotics in each sachet, aiding their survival until they can reach your dog’s intestinal tract. This formula is appropriate for use in both puppies and adult dogs, and it can also be helpful for treating excessive gas. Don’t let your best friend suffer tummy upsets any longer than he has to—let this vet-recommended supplement swoop in and save the day!

Native pet vet created probiotic powder for dogs digestive issues - dog probiotic powder + prebiotic
  • Sprinkle on dry kibble as a food topper mix with water for a broth, paw-feet alternative to probiotic chews.
  • Created by vet nutritionists to provide maximum digestive health.
  • Promotes skin health, and effectively controls yeast overgrowth, so your best pal stays comfortable and itch-free.
  • Made with all-natural ingredients for a powerful probiotic and prebiotic digestive supplement.
  • Supports overall gut health, is used as a preventive probiotic for diarrhea, serves every day.
Naturvet – digestive enzymes - plus probiotics & prebiotics – helps support diet change & a heal
  • Formulated to support and balance the digestive tract.
  • Great for dogs with sensitive stomachs and digestive issues caused by stress, antibiotics, a weakened immune system or dietary issues.
  • Features a special blend of probiotics, including veterinary-strength PB6, which helps support good bacteria in the gut and promotes a balanced and healthy GI tract and normal stool quality.
  • PB6 technology enables beneficial bacteria to travel through the complete GI tract for optimal stomach and intestinal balance.
  • Bite-size chew that you can feed like a treat.

Should you let your dog eat grass?

The majority of the time, a dog eating grass is a harmless behavior. I usually don’t stop my own dog from eating grass unless she starts to eat other plant material. There are certain toxic plants that can be growing in your yard that can harm your dog. In addition, there are a few scenarios in which it can be dangerous for your dog to eat grass and plant material including if it has been treated with pesticides or fertilizers.

Is eating grass dangerous for dogs?

Most of the time, a dog eating grass is not dangerous. You shouldn’t let your dog eat grass that has recently been treated with chemicals including pesticides or fertilizers. Also, you should not let your dog eat any kind of toxic plants in the yard. Last, is vital to not let your dog eat any foxtails. This plant has tiny pointy seeds that can get lodged in your dog’s throat and gastrointestinal tract. If there are foxtails in your yard, I recommend removing them or not allowing your dog access to that part of the yard.

What should you do if your dog is eating grass?

I recommend keeping an eye on your dog if they are eating grass. Don’t let them eat grass that has been treated with pesticides or fertilizers. In addition, if your dog seems to be eating grass excessively or if they have stomach upset including vomiting or diarrhea, it is probably time to speak with a veterinarian. If you think your pet has eaten some kind of toxic grass or plant in the yard, call a veterinarian and the Pet Poison Helpline immediately.

How do I stop my dog from eating grass?

If you notice your dog eating grass excessively, you should probably stop them. One technique to decrease grass-eating behavior is to monitor your pup when they are outside in the yard. If they try to eat grass, attempt to distract your dog with a treat instead. You can also use this method if you are on a walk.

Why do dogs eat grass? Our vet weighs in with answers

Final Thoughts

Why do dogs eat grass? The majority of the time, dogs eat grass because this is normal dog behavior that likely originated from wolves. Sometimes dogs eat grass because they are bored or because they like the taste of it. Occasionally, if you notice your dog eating grass, they may have an upset stomach causing the grass eating. Most of the time, you won’t need to worry about the grass eating unless your dog is eating grass excessively or if your yard has been treated with chemicals. Watch out for foxtails in your yard as they can be extremely harmful to dogs! You should call your vet if you suspect your dog is feeling nauseous or has signs of vomiting or diarrhea.

Alpha Paw Sale
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Dr. Addie Reinhard, DVM

Member of Alpha Paw’s Board of Pet Experts

Dr. Addie Reinhard is an experienced companion animal veterinarian who lives in Lexington, KY with her husband, greyhound, and four cats. She graduated from the University of Tennessee College of Veterinary Medicine, and currently practices in the central Kentucky region. Dr. Addie has special interests in preventative care, dermatology, and diseases, and she enjoys creating helpful educational resources related to these topics to help pet parents keep their four-legged family members happy and healthy. We love Dr. Addie’s passion for providing reliable veterinary insight and medical advice to help pet parents like us give their pups the happy & healthy lives they deserve!


The medical, nutritional, or behavioral advice we provide is intended for informational and educational purposes only. Our editorial content is not a substitute for formal or personalized medical advice from a veterinary professional. Only board-certified veterinary specialists who have examined your pet should diagnose medical conditions, provide personalized treatment, or prescribe appropriate medication. For questions regarding your pet’s health, or if your pet is exhibiting signs of illness, injury, or distress, contact your veterinarian immediately. Never disregard professional medical advice or delay in seeking it because of something you have read on our site.