Ever catch your dog munching on grass like it's their favourite snack? It’s one of those quirky things dogs do that often leaves pet owners scratching their heads.

Even when there’s food in their bowl, some dogs still choose to chew on grass. This can make you ask—why do they do it? Is it bad for them?

In this blog, we’ll discuss why dogs eat grass, whether it’s normal and safe, and when it might be something to worry about. 

Let’s get started!

Is It Normal for Dogs to Eat Grass?

Grass-eating in dogs is actually pretty common. A study in the Applied Animal Behaviour Science Journal found that more than 79% of dog owners said their dogs have eaten grass at some point.

The fact is that occasional grass-eating is not harmful in most cases. Dogs may nibble on grass out of curiosity, boredom, or even instinct. 

Why Do Dogs Eat Grass? 7 Possible Reasons

Let’s explore why dogs eat grass to help you better understand your furry friend’s behaviour.

1. It is Part of Their Natural Instinct

Dogs eating grass might be something they inherited from their wild ancestors. Wild animals like wolves and foxes often eat the stomach contents of their herbivore prey, which includes grasses and plants. So, when your dog nibbles on grass, it’s likely just a natural instinct.

This behaviour doesn’t always mean something is wrong with your dog. In fact, many vets say it’s perfectly normal.

2. They Might Be Feeling Bored or Anxious

Boredom and stress can trigger repetitive or compulsive behaviours in dogs. Chewing on furniture, licking paws, and most importantly, dog chewing grass can all be signs that your dog is looking for something to do or trying to soothe itself.

If your dog frequently chews grass, especially when alone or under-stimulated, it may be time to review its mental and physical activity levels. Try increasing daily walks, engaging toys, or interactive games to keep it mentally sharp and emotionally content.

3. It Could Be a Sign of an Upset Stomach

One of the most common assumptions is that dogs eat grass to make themselves vomit. While some dogs vomit after eating grass, research does not conclusively support that grass induces vomiting.

A study conducted at the University of California, Davis, involving 1,571 dog owners, found that only 22% reported their dogs regularly vomited after grass consumption. Additionally, only 8% of owners observed signs of illness in their dogs before eating grass.

This suggests that most grass-eating is not linked to nausea. However, for some dogs, it might be a way to relieve mild gastrointestinal discomfort.

4. They Are Looking for Missing Nutrients

Sometimes, dietary deficiencies can drive dogs to eat things they normally would not, including grass. Dogs lacking fibre, certain vitamins, or minerals may turn to grass as a natural supplement.

Grass contains chlorophyll and a small amount of fibre, both of which could help with digestion or bowel movements. If you are wondering, "Why would a dog eat grass?" The answer could lie in your dog’s current diet. 

Consulting your vet about your pet’s nutritional intake can clarify whether they are missing key elements.

5. They Simply Like the Taste or Texture

Some dogs just enjoy the texture of grass under their teeth or its fresh, earthy taste. Like humans who chew gum for satisfaction, dogs may chew grass for sensory pleasure.

If your dog is otherwise healthy and the grass-eating is infrequent, it may not be cause for concern.

6. A Habit Reinforced Over Time

Grass-eating can become a learned behaviour, especially if it once helped relieve discomfort. Even if the original trigger (such as an upset stomach) no longer exists, your dog might continue eating grass because it finds it soothing or comforting.

Over time, this behaviour can become habitual. The key is to monitor frequency and note any changes in their overall behaviour or appetite.

7. Medical or Digestive Concerns

While occasional grass-eating is normal, frequent or sudden obsession with grass could point to an underlying issue. 

If your dog suddenly eating grass like crazy, it might be a sign of gastrointestinal problems, parasite infection, or even a metabolic disorder.

Should You Be Worried? Risks of Dogs Eating Grass

Most dogs can safely eat grass in small amounts. However, there are a few risks to keep in mind:

• Pesticides and fertilisers: Chemically treated lawns can cause poisoning or digestive upset.
• Parasites: Grass may carry intestinal parasites, especially in communal or unclean areas.
• Choking hazard: Long grass blades or clumped dirt may pose a choking risk.

How to Prevent or Reduce Grass Eating

Now that you understand why dogs might eat grass, let us explore practical ways to manage or even curb this behaviour, starting with diet, stimulation, and safety.

• Offer a Well-Balanced Diet

Ensure your dog is getting enough fibre, vitamins, and minerals. A balanced diet can reduce their desire to seek nutrients elsewhere. Consider incorporating leafy greens or fibre-rich vegetables with your vet’s approval.

• Add More Mental and Physical Stimulation

Dogs need both physical exercise and mental engagement. Add interactive toys, training sessions, and longer walks to your daily routine. Boredom is often the root of grass-chewing habits.

• Monitor for Any Underlying Medical Issues

Schedule regular health checkups and monitor any recurring symptoms, such as vomiting, fatigue, or sudden appetite changes. 

Early detection is key to treating underlying medical problems that could be causing your dog to eat grass excessively.

• Keep Your Lawn Clean and Safe

Avoid using harsh chemicals, pesticides, or weed killers in areas where your dog roams. If the behaviour is not excessive, you can create a dog-friendly grassy patch for safe chewing.

When to Call the Vet

You should consult a veterinarian if:

• Your dog eats grass every day or in large quantities
• They vomit frequently or seem lethargic afterwards
• You notice blood in vomit or stool
• Appetite and behaviour changes accompany the grass-eating

Final Thoughts

While grass-eating in dogs may seem strange, it is usually harmless and quite common. In most cases, it stems from natural instincts, curiosity, or minor dietary needs. 

However, if the behaviour becomes frequent or is paired with other symptoms, it is best to consult your vet. A balanced diet, engaging activities, and regular checkups can also help reduce this habit. 

By staying informed and observant, you can ensure your dog remains happy, healthy, and safe—whether or not it sneaks a nibble of grass.

FAQs

Q: Why does my dog eat grass and then vomit?
Some dogs may vomit after eating grass, but not all. It may be coincidental or a natural way for them to relieve stomach discomfort.

Q: Should I let my dog chew grass regularly?
Occasional chewing is generally safe, especially if your lawn is chemical-free. However, excessive or compulsive behaviour may need further evaluation.

Q: What to do if my dog is eating grass like crazy all of a sudden?
Check for signs of digestive upset or stress. If the behaviour continues or worsens, consult a vet to rule out underlying conditions.