Why Do Dogs Eat Grass? Understanding the Behaviour and What It Means

At Jordan Dog Training, we’re often asked, “Why does my dog eat grass?” It’s one of the most common canine behaviours that can puzzle even the most seasoned dog owners. While it may look odd — or even worrying — most of the time, grass eating is completely normal. But there are exceptions.

In this blog, we’ll explore the reasons why dogs eat grass, when it may be a concern, and what you can do to support your dog if the behaviour becomes excessive.

Is It Normal for Dogs to Eat Grass?

Yes — for many dogs, eating grass is perfectly normal and not necessarily a cause for concern. In fact, a study from the University of California found that over 70% of dogs eat grass regularly, and fewer than 10% show signs of illness before doing so.

Dogs are omnivores by nature, and grazing on grass appears to be an instinctive behaviour rooted in their ancestry. Even wild canids like wolves and dingoes are known to ingest plants and grass as part of their natural foraging.

Possible Reasons Dogs Eat Grass

There are several theories — and in many cases, multiple factors may be at play:

1. Digestive Relief

Some dogs seem to eat grass when they’re feeling nauseous or need to vomit. It’s often believed that the grass tickles the throat or stomach lining, triggering regurgitation. However, this isn’t always the case — many dogs eat grass and don’t vomit afterward.

If your dog eats grass and vomits occasionally but is otherwise healthy and happy, it may not be a concern. But if it happens frequently, it’s worth checking with your vet to rule out underlying issues.

2. Nutritional Needs

Some dogs may instinctively seek out grass or other greenery if their diet is lacking in fibre or certain micronutrients. While most balanced commercial diets meet these needs, a review of your dog’s nutrition — particularly if they’re on a home-cooked or raw diet — might be helpful.

Tip: You can offer natural, dog-safe alternatives to chew or forage, such as raw carrots or healthy long-lasting chews.

👉 Check out our range of natural, healthy treats here

3. Boredom or Habit

Dogs left alone in the yard, or those not mentally or physically stimulated enough, may turn to repetitive behaviours like chewing or grazing on grass simply out of boredom. Increasing enrichment and offering appropriate outlets for chewing or foraging can help reduce this habit.

Related read: Boredom-Busting Activities for Dogs

4. Instinctive Foraging

In the wild, foraging is a normal part of daily life. Domesticated dogs still carry these natural instincts. Some enjoy sniffing and nibbling through patches of grass in a similar way they might explore scents or dig.

This is one reason we encourage decompression walks — slow, sniffy walks that allow dogs to follow their nose at their own pace.

Learn more here: What Are Decompression Walks?

5. Enjoyment of Taste or Texture

Some dogs simply enjoy the taste or texture of grass, especially when it’s fresh and soft. After a period of rain, new shoots tend to be juicier and more palatable — and this can make them particularly appealing to dogs. You might notice your dog nibbling more often during these times, especially in areas with lush green patches or sprouting native grasses.

When to Be Concerned

While occasional grass eating is generally harmless, there are situations where you should take notice:

• Your dog vomits every time after eating grass
• They’re eating grass obsessively or urgently
• They’re also eating other non-food items (pica)
• They seem unwell, lethargic, or have changes in appetite or stools

Important: Always ensure the grass your dog accesses hasn’t been treated with pesticides, herbicides, or fertilisers, as these can be toxic. Public parks and roadside verges are common areas of concern.

How to Reduce Grass Eating (If Needed)

If your dog is eating grass excessively or obsessively, consider the following steps:

• Review their diet – consult your vet or canine nutritionist
• Add enrichment – use puzzle toys, sniffing games, and foraging mats
• Offer healthy chew alternatives – like natural long-lasting treats👉 Explore Jordan Dog Training’s healthy chews here
• Ensure adequate exercise and mental stimulation
• Observe patterns – is it linked to stress, routine, or boredom?

Final Thoughts

Grass eating in dogs is usually a harmless and natural behaviour — but like anything, it should be observed in context. If your dog is otherwise healthy and happy, a bit of grass nibbling isn’t a cause for alarm. However, any signs of illness, change in behaviour, or obsessive eating should prompt a check-in with your vet.

At Jordan Dog Training, we believe in understanding your dog’s behaviour holistically. If you’re unsure whether your dog’s grass eating is a behavioural concern or just a quirky habit, one of our qualified trainers can help assess it in context and provide tailored advice.

Disclaimer: The information provided in this blog is intended as general guidance and is based on our experience as dog trainers and behaviourists. It is not veterinary advice and should not replace consultation with a qualified veterinarian. If you have any concerns about your dog’s health, wellbeing, or behaviour, we always recommend speaking with your vet to ensure the best care for your dog.