Why Does My Dog Eat Grass? (And What to Do About It)

Nearly every dog parent has likely seen their pup eat grass at some point or another. This guide solves the mystery of why dogs eat grass and dispels common myths.

Key takeaways:

• Dogs eat grass for many reasons, but there are a lot of myths about it.

• There is no proof for the nutritional deficiency or the “sick dogs eat grass to make themselves vomit” theories.

• Dogs may eat grass because they like it, are bored, or just want to scavenge.

• Beware of pesticides and other toxins on grass and plants.

• If you suspect your dog is ill, schedule a vet appointment immediately.

Does your pup enjoy nibbling on grass? There are plenty of theories and myths explaining why dogs eat grass, and not all of them are reasons you should run to the vet.

This article looks at some of the common reasons why your pup may eat grass, some concerns to keep in mind, and what to do about all of it. We’ll also bust some popular myths about why dogs eat grass.

The missing nutrients theory

The term used to describe eating non-food items is pica. One theory suggests dogs eat grass because they lack certain nutrients. Grass provides your dog with fiber, so some people claim eating grass helps your dog’s body functions run better – but there’s no proof this is true.

Researchers studied dogs who had sufficient plant supplements in their diet as well as these dogs’ grass-eating habits. They compared their behavior to dogs who had certain plant deficiencies, but neither group was more or less likely to eat grass.

The sick dog and grass myth

There is a theory that dogs eat grass when they are sick to make themselves vomit, but Psychology Today says there's no truth to it. Very few studies have been done to either prove or disprove it. One study in 2008 had 25 veterinary students take part. Here’s what they learned:

• Each student had a dog of their own, and every one claimed their dog ate grass. None of their dogs showed any signs of being sick before eating it. Most dog parents reported their dogs behaved normally before eating grass, showed zero signs of being sick, and just 8% ever vomited after eating it.

• A second survey conducted with dog owners had similar findings. Their dogs rarely showed signs of illness before eating grass, with just 4 out of 47 ill before they did so. Only six dogs vomited often after eating it.

• The researchers then expanded their efforts with a web-based survey. Out of 1,571 respondents, 68% reported their dogs ate grass regularly and a mere 8% claimed their pups showed any signs of being sick before eating grass.

There was only one part of the research that stood out: They found that a dog showing signs of illness was more likely to vomit after eating grass.

Some dogs like the taste or feel of grass

So, why do dogs eat grass? Believe it or not, many do so just because they may enjoy the taste or texture, because it is something different than their kibble or treats.

Dogs may eat grass because they’re bored

Dogs need mental stimulation. They like variety in their lives and need a lot of mental stimulation. They’ll find something to do (like eat grass) if they aren’t getting enough activities to keep their brains active.

Dogs are scavengers

Dogs are pre-programmed to forage for food. It’s in their ancestry to look for food sources. Chomping away on grass gives them a new food source, and it’s better than catching your pup digging through your garbage.

Be mindful of your dog’s grass eating behaviors

How is your dog acting before they eat grass? If they are happy and normal, they are likely eating grass because they’re bored or like the taste. If your dog has low energy, is lethargic, or has diarrhea, they may be ill. In that case, schedule a visit with your dog’s vet right away. Some things to watch for:

• Pesticides – Eating grass by itself is not harmful, but many landowners use pesticides and herbicides to ward off pests. These toxins may be harmful to your dog. Keep your dog away from areas that have been sprayed with chemicals.

• Toxic greenery – Remember to watch your dog around other greenery. Many plants are toxic and can cause serious problems if ingested. Be sure to check the ASPCA’s Toxicology and Poison Control webpage for a list of indoor/outdoor risks, clinical treatment options, and more.

Watch your dog to see how they act after eating grass. They can have allergies and other skin conditions, just like humans! If yours is acting “off” after grass-grazing, bring them to your vet.

Give your dog plenty to do

Not comfortable with the idea of your dog eating grass? Try giving them more to do. Here are a few ideas:

• Walks – Give your pup regular exercise and opportunities for plenty of sniffing.

• Stimulating toys – Give your dog treats inside Kongs, snuffle mats, and other fun toys that make them work for it. Dogs are natural problem solvers, and they enjoy having something to do.

• Play games – Brain-stimulating games strengthen your bond and make your pup happy.

Eating untreated grass is harmless for your dog, but take precautions if you let them continue grazing. Know what they’re eating, beware of pesticides and other harmful toxins, give them plenty of exercise to stave off boredom, and bring your dog to the vet if you suspect illness.

Make regular appointments for routine care

Happy, healthy pups require regular, routine care and basic hygiene, and Scenthound is here to help. Our experts are trained to look for warning signs with skin, coat, ears, nails, and teeth. After every basic hygiene and grooming viist, you’ll receive our S.C.E.N.T. Check™ report detailing our assessment of your dog’s overall external health. This helps you stay on top of small problems that can turn into big problems if ignored.

Find a Scenthound location today to set your pup up with regular routine care visits.