Is it a problem if my dog eats grass?
Updated 16 October 2026
In short: eating grass is very common and usually normal. A large owner survey (Sueda et al., 2008) found that most dogs that eat grass don't seem unwell beforehand, and most don't vomit afterwards. The real risks are pesticides, toxic plants and parasites. See a vet if your dog suddenly eats grass frantically, vomits often or shows other symptoms.
Why does my dog eat grass?
These figures come from an online survey of 1,571 owners (Sueda, Hart and Cliff, 2008). They challenge the idea that dogs eat grass mainly because of an upset stomach.
A natural behaviour
Wolves and wild dogs also eat plants. Some researchers see it as an inherited habit.
Taste, boredom
Tender spring grass appeals to some dogs; others eat it out of boredom.
Digestive discomfort
Possible in some dogs, but not the rule according to the available data.
A lack of fibre
Unlikely on a complete diet; discuss with your vet if the behaviour is intense.
Is it dangerous for my dog?
Grass itself is toxic to dogs.
FALSENo, but it may have been treated (pesticides, weedkillers, fertiliser): avoid treated lawns and field edges.
Some garden plants are dangerous.
TRUELily of the valley, oleander, yew, autumn crocus, tulip or daffodil bulbs… Learn to recognise them.
Grass awns are a real risk in summer.
TRUEThese dry seed heads work their way into ears, noses and between toes. Check your dog after walks in tall grass.
Eating grass can expose dogs to parasites.
TRUEWorm eggs can be present on soiled grass: deworm as your vet advises.
How can you limit this behaviour?
- Pick your spotsAvoid treated lawns, roadsides and field edges.
- Keep it busyScent games, chew toys, richer walks: boredom leads to nibbling.
- Teach "leave it"Reward it when it leaves the grass and comes back to you, without scolding.
- Talk about dietIf it happens a lot, review its diet with your vet.
A loose lead of the right length lets your dog sniff while you keep control: see choosing the right lead length.
When should you see the vet?
My dog:
Frequently asked questions
Why does my dog eat grass and then vomit?
It happens in a minority of dogs. If it's occasional and your dog is fine, it's usually not a worry; if it's frequent, see your vet.
Should I stop my dog eating grass?
Not necessarily. Mainly avoid treated areas and toxic plants, and watch out for grass awns in summer.
My dog eats grass: is it hungry?
Not necessarily. It's common even in well-fed dogs.
My puppy eats grass, is that normal?
Yes, puppies explore with their mouths. Just keep it away from toxic plants and treated areas.
Sources
- Sueda K.L.C., Hart B.L., Cliff K.D. (2008). Characterisation of plant eating in dogs. Applied Animal Behaviour Science 111, 120-132.