Why Do Dogs Eat Grass? & Is It Something to Worry About?

Have you ever caught your dog happily munching on grass during a walk? Yep, ours does it too. In fact, my Golden Retriever enjoys nibbling on grass so much that I sometimes wonder if he's secretly decided to become a herbivore… until I remember how much he loves chicken, fish and basically anything else he can get his paws on.

So if you're like me and you've asked yourself “why does my dog eat grass?”, you're definitely not alone. It's one of the most common questions dog owners have, and it's easy to assume something must be wrong. But we're here to reassure you that in most cases, it's perfectly normal behaviour.

Dogs might eat grass for all sorts of reasons; to help settle their stomachs, out of boredom or simply because they like the taste and texture. While it's rarely a cause for concern, understanding why your dog eats grass can help you spot if it ever becomes a sign of something more serious.

So if you're like me, and you've found yourself questioning your four-legged friend's grazing habits, then join me as we learn all about the different reasons behind this behaviour and when, if ever, it's something worth worrying about.

Canine behaviour is a fascinating subject, full of quirks and mysteries that keep even the most experienced dog owners on their toes. One behaviour that often puzzles owners is eating grass. While it might seem odd at first, research suggests that canines eating grass is actually normal behaviour and a normal part of their behavioural repertoire. In most cases, there’s no need to worry if you catch your dog munching on a few blades during your daily walk.

Canines may eat grass for a variety of reasons, and it’s not always about hunger. Sometimes, eating grass simply satisfies a natural instinct inherited from their dog's ancestors. Other times, it can be a way for dogs to cope with boredom or to seek out a bit of mental stimulation, especially if they’re not getting enough enrichment in their daily routine. By understanding the different motivations behind grass eating, owners can better support their dogs’ needs and help them lead happier, more balanced lives.

It’s one of those questions most dog owners have asked at some point: why does my dog eat grass? It’s not uncommon for you and your pup to be out and about enjoying a nice stroll when all of a sudden, those gentle sniffs of grass turn into a mini banquet. Who would have thought though that this behaviour is far more common than it might seem! In fact, most domestic dogs, and many dogs across different breeds and backgrounds, are known to eat grass, making it a widespread and normal activity.

There is a widely held belief that dogs eat grass to induce vomiting or because they are unwell, but research suggests there are several possible reasons for this behaviour. Grass eating is a natural behaviour observed in both wild dogs and pet dogs, and it is an instinct inherited from dogs’ ancestors, who were scavengers and omnivores that included plant matter in their diet. 

Turns out grass eating in dogs isn’t unusual and there are several reasons they do it… A 2008 survey of 1500 dog owners found that nearly 70% said their dogs ate plant material every day or at least once a week, with younger dogs being particularly prone to this behaviour.

To Help Their Digestion

Grass actually contains a good amount of fibre which helps keep your dog's digestive system running smoothly. Dietary fibre from grass is essential for normal bodily functions like digestion and stool passing. Sometimes, eating grass can help with digestion or even ease mild constipation by encouraging things to move along naturally. Eating grass can also support your dog's ability to digest food and maintain a healthy digestive tract. So when your pup munches on a few blades of green, it can be your dog's way of adding a bit of roughage to their diet.

Plant material, such as grass, is often found in the stomachs of wild canids and plays a role in their digestion. However, grass can sometimes be contaminated with parasites such as hookworms or roundworms from other animals' waste, and some researchers suggest dogs eat grass to relieve themselves of intestinal parasites that might be living in their digestive system.

Filling a Nutritional Gap

While it’s rare for dogs on a balanced diet and high-quality nutrition to be deficient in nutrients, some may instinctively eat grass to top up on certain vitamins or minerals. Dogs are primarily carnivores and eat meat, but their diet can include some plant material like grass. Grass contains trace amounts of nutrients like iron, zinc, and calcium, and occasionally, dogs may graze to make up for what they feel is missing.

Grass eating is rarely due to a nutritional deficiency or dietary deficiencies in dogs that are fed a balanced diet. Plus, grass is not a significant source of nutrients in a dog’s diet and is mostly consumed instinctively rather than for nutrition. So if you’ve been wondering why do dogs eat grass despite feeding them well, it’s worth checking their diet with your vet to make sure all their nutritional bases are covered.

An Instinct from Their Wild Ancestors

Long before dogs became our couch companions, their wild ancestors were omnivorous scavengers. Wolves, for example, often consumed the stomach contents of plant-eating prey which meant grass and other vegetation were part of their diet. Some experts believe this instinct still lingers today. So when your dog tucks into a patch of grass, it might just be  an ancient behaviour resurfacing, not a sign of anything wrong.

Boredom, Stress or Anxiety

Dogs are clever and curious creatures, and sometimes, they eat grass simply because there’s not much else going on. If your dog isn’t getting enough mental stimulation or physical exercise, they might start snacking on grass out of boredom. Dogs may eat grass when they are bored, especially if they lack engaging activities. Bored or understimulated dogs may also resort to other behaviours such as chewing on household items or digging in the yard to alleviate boredom.

Dogs left alone for long periods may also eat grass to pass the time. Additionally, some dogs may eat grass as a response to attention-seeking behaviours from other dogs or due to social factors. Similarly, anxious or stressed dogs may use the repetitive motion of grazing as a soothing behaviour, a bit like humans biting their nails or fidgeting. Instead, try offering more enrichment toys, puzzle feeders and extra playtime to help redirect this energy into something more engaging.

They Just Like It!

And sometimes, dogs simply enjoy the taste and texture of grass. Yup, sounds a little weird we know, but some dogs genuinely find fresh, dewy blades irresistible, especially during spring and summer. It’s a little like us snacking on crisps and chocolate, not because we’re hungry, but simply because we enjoy the taste!

To Soothe an Upset Stomach

One of the most common assumptions is that dogs eat grass to make themselves vomit or to help settle an upset stomach. And while there’s a little truth to this, studies suggest it’s actually quite uncommon for vomiting to be the main reason dogs eat grass.

In fact, fewer than 10% of dogs show signs of illness before eating grass, and only around 25% actually vomit afterwards. So although some dogs may occasionally munch on grass when they feel a bit nauseous, most dogs eat it without being sick at all.

That said, if your dog is regularly vomiting after eating grass or seems unwell alongside the behaviour, it’s always worth speaking with your vet to rule out any underlying health issues.

Most of the time, a little grass nibbling is perfectly normal and nothing to worry about. But, like many quirky canine habits, there are moments when it’s worth paying closer attention, especially when it comes to your dog's health. If your dog is eating grass in large quantities or seems ill, monitor them closely and consider seeking veterinary advice.

For example, if you notice a sudden increase in how often your dog is eating grass, or they seem unusually fixated on finding patches to graze on, it might be a sign of something more going on beneath the surface, whether that’s a digestive issue or nutritional imbalance. Be sure to monitor your dog for excessive or sudden changes in grass-eating behaviour, particularly in older dogs, as this can sometimes signal a problem.

Eating grass can also sometimes indicate an underlying health issue or medical problem, especially if the behaviour is excessive or new. In rare cases, excessive consumption of grass can lead to gastrointestinal issues such as intestinal blockages. Dogs may also eat non food items, including grass, which can sometimes be a sign of pica or other behavioural issues.

You should also take note if your dog appears unwell or ill before or after eating grass. Things like lethargy, bloating or general discomfort can sometimes indicate that their tummy isn’t quite right. Occasional vomiting isn’t uncommon after eating grass, but if it starts happening frequently, or your dog loses interest in food altogether, it’s best to speak with your vet for advice.

It’s also important to think about where your dog is snacking. The garden is a common place where dogs eat grass, but grass in parks or gardens can sometimes be treated with pesticides or herbicides, which can be harmful if ingested.

Grass can also be contaminated with intestinal parasites such as hookworms or roundworms from other animals’ waste, and eating contaminated grass like this can make a dog sick. Additionally, slug and snail slime trails on grass can transmit lungworm to dogs, which can be serious if untreated. Try to make sure your pup’s grazing grounds are safe and chemical-free.

You know your dog best, so if something feels off, trust your gut. Monitoring your dog’s health is important, and if you notice any concerning changes, there’s never any harm in getting them checked at the vets and asking the experts for some advice.

If you notice your dog is eating grass more frequently or you're concerned about their grass eating habits, it's always a good idea to consult your veterinarian. While grass eating is usually harmless, it can sometimes be a sign of underlying medical conditions such as inflammatory bowel disease or gastric reflux. Your vet can help determine if your dog's grass eating is linked to a health issue and recommend appropriate treatment if needed.

Regular veterinary check-ups are essential too for catching potential health issues early, before they develop into more serious medical conditions. Your vet can also offer advice on how to keep your dog mentally stimulated and prevent boredom, both of which can contribute to grass eating behaviour. 

And if your dog shows any signs of discomfort, vomiting, or other health issues alongside their grass eating, don't hesitate to seek professional advice. Addressing both the physical and emotional needs of your dog is key to supporting their overall wellbeing.

Even if you now know the answer to “why does my dog eat grass” and feel reassured that it’s usually nothing to worry about, that doesn’t necessarily mean you want it to become their favourite hobby. No one wants to be constantly stopping mid-walk so your dog can snack on the nearest tuft of grass… it’s not exactly ideal!

So instead, why not consider a few of these little tips and tricks on how to stop your dog from eating grass and redirect their attention elsewhere!

Make Sure Their Diet Is Nutritious and Balanced

One reason dogs nibble on grass is that they might be missing key nutrients. If you're wondering why does my dog eat grass, it's worth checking that their meals are high quality, well-balanced, and full of fibre. Adding natural food toppers for dogs, dog-safe veggies like carrots and peas, or supplements designed to aid digestion can really make a difference. 

Take Treats on Walks to Redirect Their Focus

Having high-value dog treats on hand is a simple way to distract your dog from grassy patches. If you spot them eyeing a blade of grass, call their name and reward them when they return to you. This teaches them that paying attention to you is far more rewarding than grazing. Treats in a pocket or a convenient dog treat pouch make this easy to manage on every walk.

Teach Them The “Leave It” Command

“Leave it” is a lifesaver for grass-eating prevention. Start at home with treats or toys, then practise outdoors. When your dog goes for grass, calmly say “leave it” and reward them for listening. Over time, this builds a positive habit and teaches them to check in with you before taking a bite. Not only does this help with grass eating, but it's truthfully a handy command for all sorts of situations.

Keep Them Stimulated with Enrichment Toys

Boredom can be a big factor behind grass munching so making sure your dog is both mentally and physically tired out can help prevent it. Try using slow feeder dog bowls, lick mats and treat-dispensing toys at home to give your dog something rewarding to focus on. Enrichment toys for dogs satisfy their natural foraging instincts and keep their mind busy which in turn should help reduce their urge to snack on grass just to pass the time.

Create Positive Associations Outdoors

It's also a good idea to make walks more about just sniffing and snacking. Try bringing their favourite fetch toy or do some training out in the open. This not only helps keep walks fun and engaging but it'll eventually teach them to change their habits while out and about and reduce those grassy indulgences.

If your dog’s grass eating seems to be driven by boredom or a need for more mental stimulation, there are plenty of fun and healthy alternatives you can try. Food puzzles and interactive toys are fantastic for keeping your dog’s mind engaged and can help redirect their focus away from grass. Obedience training sessions and scent work games are also great ways to provide mental stimulation and satisfy your dog’s natural curiosity.

Making sure your dog’s diet is balanced and includes enough fibre can also help reduce the urge for grass eating. Sometimes, dogs turn to grass when their food isn’t meeting all their nutritional needs. Owners might also consider offering safe, dog-friendly grasses like wheat grass or oat grass as an occasional treat, which can satisfy their dog’s instinct to graze without the risks associated with unknown plants.

By providing a variety of enrichment activities and ensuring your dog’s diet is complete, you can help minimize grass eating and support a healthier, happier lifestyle for your furry friend.

Most of the time, grass eating is completely normal and nothing to worry about. Some dogs seem to do it out of instinct, some out of boredom and others simply because they enjoy the taste or texture while they’re out exploring on walks. While it can occasionally be linked to digestion or a mild nutritional gap, it’s rarely a sign of anything serious on its own.

That said, it’s still worth paying attention to any sudden changes in behaviour. If your dog suddenly starts eating a lot more grass than usual, seems unwell afterwards, loses their appetite or is regularly vomiting, it’s always best to speak with your vet for some reassurance.

And if you’d rather your pup didn’t treat every grassy patch like an all-you-can-eat buffet, there are a few simple ways to help redirect the habit. Enrichment toys, lick mats, balanced food toppers and tasty training treats can all help keep your dog mentally stimulated and focused elsewhere. Commands like “leave it” can also make a big difference over time too.

Here at WOOOF, we’ve got everything you need to support your dog’s health, happiness and daily enrichment, from treats and toys to supplements designed to help keep tails wagging.

This article does not constitute veterinary advice. For any concerns about your dog’s health or grass eating behaviour, always consult a qualified veterinarian.

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