Why Do Dogs Eat Grass? (And When You Should Be Concerned)

If you’ve ever watched your dog suddenly stop and start eating grass on a walk, you’re not alone.

It’s one of the most common (and confusing) behaviours dog owners see.

So… why do dogs eat grass?

Is it normal? Is it a sign something is wrong? Or is it just one of those “dog things”?

In this guide, we’ll break down:

• The most common reasons dogs eat grass

• When it’s normal vs when to be concerned

• What it means for your dog’s behaviour

• When (and if) you should stop it

Is It Normal for Dogs to Eat Grass?

Yes—grass eating is very common in dogs.

In most cases, it’s completely normal and not something to worry about.

Many dogs:

• Eat grass occasionally

• Show no signs of illness

• Continue their day as usual

But the reason why can vary.

5 Common Reasons Dogs Eat Grass

There isn’t just one explanation—there are several possible reasons.

1. Instinctual Behaviour

Dogs are natural scavengers.

Even domesticated dogs still have instincts from their wild ancestors, who ate plant material as part of their diet.

Grass eating may simply be:

• Natural

• Instinctive

• Not harmful in most cases

2. Curiosity or Boredom

Sometimes, dogs eat grass simply because:

• They’re exploring

• They’re bored

• They’re looking for something to do

This is especially common in:

• Puppies

• High-energy dogs

• Dogs without enough mental stimulation

If your dog is easily distracted on walks, this can also tie into focus and engagement—something we address in structured Surrey dog training programs.

3. Upset Stomach

One of the most common beliefs is that dogs eat grass to make themselves throw up.

Sometimes this is true—but not always.

Some dogs:

• Eat grass quickly

• Then vomit

Others:

• Eat grass and don’t get sick at all

So while grass can be linked to stomach discomfort, it’s not the only reason.

4. Taste or Texture

Some dogs just like grass.

It may be:

• The texture

• The smell

• The taste (especially fresh grass)

This is more common than people think.

5. Lack of Structure on Walks

This is the one most people overlook.

If your dog:

• Constantly stops to eat grass

• Ignores you on walks

• Is all over the place

…it may be less about grass and more about lack of focus and structure.

Dogs that aren’t given clear direction often:

• Wander

• Sniff excessively

• Eat random things

This is something we commonly address through dog pulling on leash training in Surrey, where dogs learn how to stay engaged and focused during walks.

When Should You Be Concerned?

Most of the time, grass eating is harmless.

But you should pay attention if your dog:

• Eats grass excessively or obsessively

• Shows signs of illness (lethargy, loss of appetite)

• Eats grass along with other non-food items

Should You Stop Your Dog from Eating Grass?

It depends.

You may NOT need to stop it if:

• It’s occasional

• Your dog is healthy

• There are no negative side effects

You MAY want to stop it if:

• It becomes frequent or compulsive

• Your dog ignores you on walks

• It’s paired with poor behaviour (pulling, lack of focus)

How to Reduce Grass Eating on Walks

If grass eating is becoming a habit, here’s what helps:

1. Improve Engagement

Your dog should be paying attention to you—not constantly scanning the environment.

2. Add Structure to Walks

Clear expectations reduce wandering behaviour.

Dogs that understand:

• Where to walk

• How to behave

Are less likely to:

• Stop randomly

• Eat grass constantly

3. Address Underlying Behaviour Issues

If your dog:

• Is overstimulated

• Doesn’t listen outside

• Struggles with focus

Grass eating is often just a symptom.

Our real-world dog training in Surrey BC focuses on building calm, structured behaviour in environments where distractions are everywhere.

4. Provide Enough Physical & Mental Stimulation

Dogs that are:

• Under-exercised

• Mentally bored

Are more likely to develop OCD habits like grass eating.

Grass Eating vs Real Behaviour Problems

It’s important to separate:

If your dog:

• Eats grass occasionally → normal

• Eats grass constantly and ignores you → training issue

Final Thoughts: Why Dogs Eat Grass

In most cases, grass eating is:

• Normal

• Harmless

• Not something to worry about

• Helps to clean out there internal organs

But when it becomes frequent or tied to poor behaviour, it can point to a bigger issue—usually around focus, structure, and engagement.

Need Help with Your Dog’s Behaviour?

If your dog:

• Doesn’t listen on walks

• Gets distracted easily

• Struggles with focus outside

We can help.

👉 Book a consultation today and start building a dog that listens in the real world.