Why Does My Labrador Eat Grass?


Does your Labrador eat grass? Grass eating in dogs feels like an odd behavior for a carnivore, but it’s actually very common. Your dog isn’t going vegan, feeling unwell or even having trouble with their mental health. Many believe grass eating in dogs is a way to induce vomiting, but this theory doesn’t stand up to scientific scrutiny. Why dogs eat grass is often still a bit of a mystery, but at least it doesn’t generally do them any harm!


Is a dog eating grass normal behavior?

The first thing to point out is that almost all dogs eat grass from time to time. So, even if your Labrador does a passable impersonation of a grazing sheep on his daily walks, you probably don’t need to take him for therapy.

He is perfectly normal.

But he looks crazy!

Some dogs caper about wildly whilst they ‘graze’, racing here and there, exuberantly. Snatching at great clumps of grass in a manic display of silliness.

Again, although occasionally, a dog that behaves this way may have some kind of obsessive-compulsive disorder, such disorders are rare. Snatching and chomping at grass, however crazy your dog may seem, is not usually a sign that your dog is deranged.

Do dogs eat grass to induce vomiting?

One long standing theory about grass eating is that dogs do it to relieve stomach upsets.   In 2008 a study was carried out which tried to test this theory. The researchers in the study induced a mild intestinal upset in some of the dogs in the study by feeding them controlled quantities of fruit sugars.

The remainder of the dogs (the control group) were not subjected to the intestinal upset.  The researchers then gave the dogs access to two common types of grass.

The results were quite surprising. The dogs in good health actually ate more of the grass than the dogs with upset stomachs.

In addition, out of over three hundred dogs, grass eating was only followed by vomiting in two of them.

Unfortunately, whilst interesting, all the study really showed was that dogs who have been fed fruit sugars, don’t use grass to relieve their symptoms.

It doesn’t really address a dog’s response to other types of gastric disorder or nausea. Nor does it address the question of parasites.

Do dogs eat grass to get rid of parasites?

My mother used to tell me that dogs eat grass to get rid of worms.

If my dogs start eating grass,  one of the first things I do is to check their worming status, and if they have not been wormed recently,  then I treat them.

Opinion seems divided as to whether or not this is just a myth, but I don’t believe anyone has put this theory to the test with a proper controlled study.

Does grass have dog nutrients?

There are also theories that there may also be times when grass is actually an attractive addition to your dog’s diet.
Fresh, newly growing spring grass, for example, is rich in nutrients.

Whether these nutrients are actually available to the dog is another matter however

As dogs are not normally able to effectively digest plant material, unless it has been broken down in some way (crushed or semi-digested).

Why do dogs eat grass?

If your dog eats grass,  you are in good company. Most dogs do this from time to time.

It is possible that your dog occasionally eats grass to dislodge parasites or to induce vomiting. But most of the time,  we just don’t know why dogs do this.

Obviously, if your dog is regularly vomiting for whatever reason, he needs to see a vet. But happy grass chomping without side effects, in an otherwise healthy dog, is simply nothing to worry about.

How about you?

Does your dog eat grass?  Do you think he enjoys it? Share your experience in the comments box below

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  1. My 13 month old chocolate lab has been munching voraciously on the new spring grass. I was worried until I read the posts here. She never gets sick but I have observed the fragments of undigested grass in her 💩. Last year she did manage to swallow a snake skin like it was a string of spaghetti that required a trip to the vets for a stomach pump 😅 I still love ❤️ her to death!!

  2. Our 6 year old lab munches grass, she loves it, it’s me that has the problem with it! She vomits or poops it out in strings. Worse still is when it seems to get caught in between and cause discomfort in her gut, lots of vomiting and pain until it’s passed and a big vet bill for anti sickness and pain relief. Drives us crazy, we wish she’d stop with her ‘salad’ intake!

  3. My dog doesn’t eat grass. I don’t even have a dog. My child, however, chomps down on the stuff like a hungry goat every time we let her out of her pen. Anyone else got a child that won’t stop eating grass? I’m not sure why she does this. We’ve tried moving her on from her biscuit diet onto meats (mainly chorizo) but she still exhibits this behavior whenever we take off her shackles.

  4. My 6 year old yellow has been munching on grass the past few years. I let him mow the lawn now. Does a pretty good job.

  5. My 3 year old black lab eats grass. She grazes. However she doesn’t always get sick. She eats sticks and grabs rocks too. I thought it might be her diet.

  6. My 4 year old black lab has been eating grass for as long as I have had her(about 3 1/2 years). People have told me this is normal and is nothing to worry about, but she always vomits up yellow bile shortly after eating the grass. Surely this can’t be normal ?

  7. I have a retired breeder from a guide dog school. She and all her offspring really graze. In fact every dog I’ve cared for from the school eats grass. It doesn’t seem to hurt them. They just chomp away. The vets at the school aren’t concerned so I’m not either. I just make sure there are no harmful chemicals on the lawn.

  8. My lab only ever ate grass occasionally, however I have noticed a big increase in grass consumption since she started displaying symptoms of arthritis. The worse the arthritis has got over the past 6 months the greater her consumption of grass. Is there any research that links it to pain relief?

  9. My vet said he is craving for fibre in his diet hence I’ve introduced cooked veges and cooked rice and his regular meat. He was on a 100%protein diet. Waiting to see if he stops grazing

  10. My black lab who is 9 months old will eat grass from time to time but today he eat some grass and then vomited and it was a little foamy as well. I’m worried and I’m not sure if he’s sick. He was completely fine all day, he was chewing on one of his favorite bones deer antlers but then I took him outside and this happened he then came in and drank a lot of water and now he’s laying down. Please help!
    Thank you!!

  11. My black lab is highly allergic to five types of common grass. He grabs clumps of it and runs around like a maniac then starts wobbling around and losing his footing like he is very unwell ????????????

  12. Not sure how to respond. I’m not a zoologist and most of my consistant success in training comes from the building blocks of whst Pippa has given me. My black lab is smart like most. He has daily training and contact. He shows no signs of aggression or compulsive behaviour. His nana used a lazer light once and I stopped it immediately and he hunts in places where I’d think he’s gone crazy from the lazer but I’m thinking he’s just so nosey that he smells ants and spiders or anything living in the places he attends to which made me think he’s been affected by the lazer light. But after much thought and observation and training I think his nose is guiding some of his behaviour. Which brings me back to the topic. He rips clumps of grass. He digs and then licks the small rocks under and swallows the smaller ones at certain times a day. The more I tried to make him stop the more he did it. now I don’t care and redirect his energy when I see him and he easily changes his thought to the new behaviour. I think he was hunting bugs. Worms ants. Things we don’t see. His mom and dad are great duck dogs. The more I tried to stop it the more I affirmed him to please me. He still gets in moods when he’s bored and asks to go out and that’s when I find him persuing the clumps. FYI he also eats 6-8 raspberries a day from my garden and eats well balanced diet. It’s all very interesting to me. I think he’s hunting

  13. Thank you all so much for your comments on this as it’s been very helpful. We have just got a 10 week old lab – he’s gorgeous but loves to eat all manner of plants and grass in the garden and I’ve been unsure when to stop him. I tend to when it’s shrubs and plants as I’m not sure what’s poisonous to him – any advice on this?

    • My golden never bothered with plants, flowers or shrubs, he is 9yrs old and in great health, my lab who is 4 mths. i had to rip our entire garden out because he was fond of trying to eat plants that were poisonous to him.
      My garden is now very ugly, but my boy is safe from being poisoned.
      I have no inclination on what could poison him and started to do a lot of research and found all my favorite flowers were toxic to my baby boy hes a black lab..I have an app called pl@ntNet its awesome. I take pics of whats around and it tells me what it is,I then proceed to google them. There is so many plants that are toxic it actually shocked me. Anyway my best advice download an app like I did take a pic then google it, and try to keep him away from all that kind of stuff, I myself was quite ignorant as to what could hurt my pup, bc my golden never ever bothered with anything, this little guy is into everything 🙂

  14. Hi, my boy eats grass too… But only a certain type. He has vomited it out as well.usually quite big.In one piece. I don’t know why he does it but he loves cabbage,green beans and spinach. Maybe there’s iron in it…. Happy Labing! They are so gorgeous! X

  15. I had noticed my Lab eating grass many times over the past eight months but thought at first he was trying to satisfy his thirst because he tended to do it when the grass was wet from an overnight rainfall or the morning dew. This morning he ate grass after doing his morning business and then proceeded to vomit. He even sat down as he was regurgitating the grass. This morning was the first time he stopped and went through the grass eating synario twice. After he finished he pranced home and ate his morning meal, no problem.
    I was very glad to discover your web site. I will be reading all of the articles because on the questions my wife and I have had with Max ever since he discovered us last July 5th. I was weeding in the front yard and he came up from behind me and stuck his black head through my legs. We live in Black Bear country so after I was able to get my heart back down from the rooftop, I took him to the front door, rang the bell and when my wife came to the door with a puzzled look on her face, I point to the dog and said: “Mommy he followed me home, can I keep him?” Of course, she fell in love with him right away and let him in. After checking with the Humane Society we found a chip but all the numbers were disconnected. We ran the required lost dog ads with a picture but received no response. After the waiting period the Humane Society called and said he was our dog. It has been a very rewarding experience, even healthy. I’ve lost 10 pounds!

  16. My chocolate lab Bauer is 5 and he eats grass also. But I think he eats it because he enjoys it…lol We tell him to stop when we notice him eating it but he just gets all excited wags his tail and keeps on eating it.. He never vomits.. We wonder if this would hurt him at all but he has been doing it for awhile and he seems fine…

  17. My almost 4 year old chocolate lab just started eating mulch a month ago. She has thrown it up twice. She used to chew on a stick or a large piece of mulch but spit it out. Now she gets smaller pieces and swollows it. She is fed Acana and a supplement so her diet should be just fine. She has always eatin small amounts of grass but never throws that up. Any words of wisdom are welcomed

  18. have a five year old lab/retriever cross who has always eaten grass, he doesn’t eat large quantities just grabs a few pieces every now and again while on his walks, it never makes him sick he just likes it, it can show up undigested in his poo but has never been a problem as he doesn’t eat huge amounts.

  19. My 4 year old lab eats grass every time we go out for a walk. He doesn’t do it to make himself sick. I’ve always wondered why he does it.
    Our other dog that we lost a few years ago (not a lab) only ate grass to make herself sick.

  20. My black lab ate grass for ten years didn’t think nothing of it till he became very ill. Took him to the vet he had a mass in his stomach and it was cancer a week later I was putting him down! I took him out one last time and he decided to eat some dirt and throw up! He threw up grass that was twined up really hard the size of an Italian sausage! He had bleeding ulcers and kidney infection caused from eating grass all those years! Grass doesn’t digest they must throw it up or poop it out! He’s ok now! Mike

  21. I have a chocolate lab whos 16 months old and at the minute eats grass every day and is never sick.i thought it was because we recently sowed a new lawn and this was the attraction.hes a healthy lab with a shiney coat I can only presume its doing more good than harm.helpful article.

  22. Reading the above article has giving me a conclusion based on my experience with my 5 years old Labrador which I’m pretty sure he’s completely clean of any sort of parasites and worms, the other matter is that he munches almost always on grass and always vomits afterward. So keeping in mind that he’s perfectly healthy and fit, my conclusion is that he’s eating grass for one purpose: cleaning his stomach from the unwanted digested food.

  23. What a rubbish article! The title was why does your dog eat grass? After finishing ,the conclusion was ,we don’t know! What a waste of time to even have this up here! That is 5 minutes of my life I won’t be getting back!

    • And another couple of minutes wasted writing a useless response!! How rude :(( Everyone else seemed to enjoy reading it.
      Thanks Pippa, love reading all your articles :))

    • Nope regardless of the content this article has still made way for the chance for people to post their experiences with dogs eating grass , without this they’d be no comments to post… So the most important thing about this article are those people below it posting their experiences with said issue…,

      So by far a waste of time if one is to read other people’s comments in response to it…

  24. Our 8 year old and 3 year old daughter both nibble, Mum probably more so but never to any ill effect. When the grass is dewy I think they like the refreshing moisture too. Keeps things moving internally I think.

  25. Great article……
    Our 3 labs Clara, Rosie & Bobbie are all grass munchers, on nearly every walk, especially on their morning walks, when the grass is damp. They love it…..

  26. My dog loves munching on grass (especially sweet spring grass) to the extent that it is now one of the biggest challenges in the “Total Recall” programme I am working on! He will often stop to ” graze” and becomes so engrossed he develops selective hearing and ignores my calls for him to come. It is obviously very self- rewarding for him so I need to carefully plan using the recall whistle and more attractive rewards.

    • My dog used to be a serial chomper of grass until she developed an upset stomach. She was vomiting, off her food and had runny poos. The vet could feel something in her abdomen, I knew she hadn’t eaten anything she shouldn’t have. I told the vet she had eaten grass, but he said it wouldn’t have that effect. He was wrong, 2 days later she passed a huge rope like mass of grass. She had eaten so much long grass and not chewed it, it had formed a rope and started to block her intestines. Grass is indigestible and could cause a blockage, she was lucky she didn’t need surgery.

    • every time i take my dogs for walks they have always eaten grass, never had any problems at all, maybe in the spring i might not let them eat as much, because if horses eat to much spring grass they can get laminitus, im not saying that the dogs would have it, but just do it as a precaution.

  27. My 15 week old chocolate lab puppy loves to nibble on grass and has never shown tummy problems or vomiting from it. I almost think that she just has a fascination with it! She does, however, pick up sticks and rocks which I remove from her mouth. Unfortunately, she sees my attempt to remove these objects from her mouth as a game of keep-away, so I have to chase her first. I’ll have to work on teaching her “drop it”.

  28. Hmm… I was quite convinced the mystery of grass eating was already solved. At least I have been blissfully happy with the hypotheses that says: dogs eat grass to get fibers. Dogs (wolves) as well as humans need fibers to swipe clean our intestines and avoid constipation. It is also possible that due to warming weather in the springtime the potential of the bacteria – living inside guts and taking part of the digestion process – is getting “too good” living conditions and might multiply too quickly becoming eventually harmful to their guts.

    And evolution has “taught” our 4-legged friends that to shorten the time food spends inside of them is on these conditions a good idea.

    It is true that all dog food products nowadays consist largely of fibers – it is after all the cheapest and most fulfilling part of a meal. But it cannot annul hundreds of thousands of canine evolution.

    P.S. Adding raspberries, broccoli, apples, whole-grain products to our human diet does wonders for your stomach too – try it. My lab is happy with just grass.

    P.P.S. has anybody done throat examination to the dogs in these studies after they have eaten grass and before vomiting? I bet my dog’s green chewing ball there is a correlation. Or swallowing a snail… :p

    • To counter my bacteria explanation (after all I don’t know how stomach temperatures of dogs and the weather correlate), one more hypotheses for eating fibers: on warm weather it takes less energy to maintain body temperature. So canines eat more fibers to not take all the calories out of the eaten food (they excrement them). Why they still eat the same amount? Because of “empty stomach hormones” are not so flexible, or because wolves ate always as much as possible, because of the potential future famine. Another hypotheses concluding from that would be: overweight dogs eat (more) grass. It would explain why dogs whose stomachs didn’t function properly and were therefore more stressed about having more energy stored in their body to withstand the potential starving during illness.

  29. My Shelby is a Purebred Labrador and she Grass at any and all Opportunity that she could, She was only Sick once from Eating Grass. But up until she Passed away it was a regular part of her diet, it just passed through her. the only time she missed it was in the Winter time, But she munched it Daily for years with not Ill effects at all. I called her my little Cow, I was just waiting for her to start Mooing Lol….

  30. Not only does my puppy (about 10 weeks) eat grass, but he loves to eat dead leaves too. Is this normal for a puppy?

  31. My 2-year old black lab LOVES eating fresh shoots of grass and likes to run through fields of young wheat taking mouthfuls! The only problem we have is when only half a blade of grass comes out the other end!!!

  32. My Lab has favourite patches of grass on three of our regular walks. He always stops for a munch and is never sick, so I don’t worry about it. He never eats any other grass on the walks, so I just guess there’s something particularly tasty about those clumps of grass and he just likes them.

    • My dog definitely eats grass and out of all the times he’s done so, he’s only vomited once. He seems to have pica and eats even stranger things. He eats dirt, Kleenex, birdseed and feces. The eating of feces seems to be seasonal, only during fall and winter. His eating birdseed has caused him to get coccidiosis twice. So I have to watch him closely.

  33. My lab eats grass on every walk when it’s available. It doesn’t seem to bother him so we don’t worry about it. We do try to stop him from eating grass that may have been treated by chemicals though.

    My question is why, oh WHY does he love to roll in dead animals???

    • Not pnly does our dog eat grass, but she eats mulch too. This can’t be good for her but she can’t be stopped…help!

    • My 10yr old lab is a grazer has been all her life she even eats the dirt we rescued her from a farm so I’ve always said thats why?
      Now I have a 2yr old and she does same thing crazy labs

  34. Oh I’m so grateful for this article!!
    Both my dogs a sprocker and a lab have recently started munching away on the new long fresh spring grass, they too have favourite spots and I’ve been desperately trying to deter them, but I won’t bother now. I’ve been worrying if I need to change their diet even though they are on a good diet and worrying if their stomachs are off but all stools are normal except for the grass that hasn’t digested!!! This upsets them more than anything, they run round in circles all upset if they get a grass tail : /

  35. Yes my Labrador and German shepherd both eat grass, Labrador more so. They love the long thick grass and go to the same spots in our field…copying my Shetlands!!! I too wondered if it’s a deficiency in a nutrient, but don’t think so…just like grass…or hay. She looks like a farmer!!,

  36. My Labrador, Nell, spends ages grazing in the Spring and I think she just likes it! It’s certainly difficult to recall her once she starts chomping! It’s only ever a certain type of grass, and my previous two labs have done the same with the same type of grass.

  37. Very interesting! Murphy (7 months) used to eat grass all the time from 3 months old. This suddenly stopped at 6 months but he has now started again, eating the “dead/brown” grass where he wee`s in the garden. Whilst out walking he hardly ever eats grass! Speaking to various owners and my vet there seems to be no common denominator as to why. He`s never vomited after eating and the stools are consistant. We`ve started feeding a few raw vegetables (carrot, brocoli etc.) into his kibble to see if this effects his habit .

  38. Yes – got a grass chomper here! Lady loves certain types of grass and young wheat shoots especially (sh! don’t tell the farmer). No ill effects apparent except grass is obviously not very digestible and if she’s been chomping very long grass we’ve had the occasional “extra tail” experience which was not much fun to deal with.