Why Do Dogs Eat Grass? What Every Dog Owner Should Know

If your dog regularly stops to munch on grass during a walk, you’re definitely not alone.

Grass-eating is incredibly common in dogs, and in many cases it’s completely normal. Some dogs seem to enjoy the taste or texture, while others may eat grass because they’re bored, hungry or experiencing mild digestive discomfort.

The important thing is knowing when grass-eating is harmless and when it could be a sign that something else is going on.

Is It Normal for Dogs to Eat Grass?

Yes. Eating grass is a common behaviour in dogs and doesn’t automatically mean there is anything wrong.

Some dogs graze occasionally, while others seem to actively seek grass out.

Possible reasons include:

• They like the taste or texture
• Boredom
• Hunger
• Seeking extra fibre
• Mild stomach discomfort
• Habit or learned behaviour

For many healthy dogs, occasional grass-eating is simply part of normal behaviour.

Do Dogs Eat Grass Because They Feel Sick?

Sometimes, but not always.

One of the most common beliefs is that dogs eat grass because they want to make themselves vomit. In reality, many dogs eat grass without being sick afterwards.

The Kennel Club notes that grass-eating is common and that the exact reason dogs do it isn’t always clear. Some dogs may eat grass when they feel nauseous, but it can also be a completely normal behaviour. (thekennelclub.org.uk)

If your dog regularly eats grass and then vomits, that is worth paying more attention to.

Could My Dog Be Eating Grass Because They Need More Fibre?

It’s possible.

Grass contains fibre, and some dogs may be drawn to it if their diet is lacking in roughage. However, grass-eating on its own doesn’t necessarily mean your dog has a nutritional deficiency.

A complete and balanced dog food should provide the nutrients your dog needs.

If your dog suddenly starts eating much more grass than usual, it may be worth reviewing their diet and discussing it with your vet.

Can Eating Grass Be Harmful?

Grass itself is not usually the main concern.

The bigger risks are what may be on the grass.

Grass can be contaminated with:

• Pesticides
• Weed killers
• Fertilisers
• Slug pellets
• Animal faeces
• Parasites
• Chemicals used on public or private land

PDSA advises keeping dogs away from areas recently treated with garden chemicals and contacting a vet if poisoning is suspected. (pdsa.org.uk)

If you know an area has recently been sprayed or treated, don’t allow your dog to graze there.

What About Grass Seeds?

Grass seeds can be a completely separate problem.

During warmer months, sharp grass seeds can work their way into a dog’s:

• Paws
• Ears
• Nose
• Eyes
• Coat

Dogs with longer or feathered coats can be particularly prone to picking them up.

Check your dog after walks, especially between the toes and around the ears.

When Should I Worry About My Dog Eating Grass?

Occasional grass-eating in an otherwise healthy dog is usually nothing to worry about.

Speak to your vet if your dog:

• Suddenly starts eating much more grass than usual
• Eats grass obsessively
• Vomits repeatedly
• Has diarrhoea
• Seems lethargic
• Stops eating their normal food
• Loses weight
• Appears uncomfortable or in pain
• Has a swollen or painful abdomen

A change in behaviour combined with other symptoms is more important than grass-eating on its own.

Why Does My Dog Eat Grass and Then Vomit?

Some dogs vomit after eating grass because the blades can irritate the stomach or throat.

If it happens occasionally and your dog seems completely well afterwards, it may not be significant.

However, repeated vomiting should not be dismissed as normal grass-eating behaviour.

Persistent vomiting can have many causes and should be assessed by a vet, particularly if your dog is also lethargic, refusing food or showing signs of pain.

Should I Stop My Dog Eating Grass?

Not necessarily.

If your dog only eats small amounts of clean, untreated grass occasionally and is otherwise healthy, there may be no need to stop them.

It is sensible to discourage grass-eating when:

• The area may have been treated with chemicals
• There is obvious contamination
• Your dog eats large quantities
• They repeatedly vomit afterwards
• Grass-eating has suddenly increased

Could Boredom Be the Reason?

Yes, particularly if your dog grazes in the garden when they have little else to do.

Providing more enrichment can help, such as:

• Sniffing games
• Puzzle feeders
• Training sessions
• Chew toys
• Longer or more varied walks
• Food-dispensing toys

Sometimes a dog that seems obsessed with grass simply needs something more interesting to occupy them.

The Bottom Line

Grass-eating is very common in dogs and is often completely normal.

Some dogs simply enjoy it, while others may eat grass because of boredom, hunger, fibre-seeking behaviour or mild stomach discomfort.

The main things to watch are sudden changes, repeated vomiting, other signs of illness, and whether the grass could be contaminated with chemicals or parasites.

If your dog is otherwise happy, eating normally and behaving as usual, the occasional mouthful of grass is rarely a cause for concern.

FAQs

Why does my dog eat grass every day?

Some dogs simply enjoy eating grass and make it part of their normal routine. If your dog is otherwise well, this may not indicate a problem.

Does eating grass mean my dog has worms?

Not necessarily. Grass-eating alone is not a reliable sign of worms. If you are concerned about parasites, speak to your vet about an appropriate worming plan.

Why does my dog eat grass when their stomach is upset?

Some dogs may seek grass when feeling nauseous or uncomfortable, although not every dog that eats grass is unwell. (thekennelclub.org.uk)

Should I stop my dog eating grass?

Usually not if the grass is untreated and your dog only eats small amounts. Avoid areas that may have been treated with pesticides, weed killers or fertilisers.

When should I contact a vet?

Contact your vet if grass-eating is accompanied by repeated vomiting, diarrhoea, lethargy, appetite loss, weight loss or obvious discomfort.