If you have ever wondered why does my dog eat grass, relax: it is one of the most common behaviours and, almost always, entirely normal. Plenty of dogs nibble at the lawn on every walk and some even seem to eat grass with a certain desperation. In this guide we go through the most frequent causes, what it means when your dog eats grass and vomits and, above all, when you really should be concerned.
Why does my dog eat grass: the usual causes
Science still doesn't have a single answer, but there are several explanations that keep coming up. These are the reasons your dog eats grass:
- Natural instinct: the dog descends from the wolf, which also takes in plant matter and grass through its prey. It is inherited behaviour.
- He likes the taste and texture: many dogs enjoy fresh grass, especially in spring and summer when it is at its most tender.
- Boredom: a bored dog looks for stimulation, and nibbling grass is one form of it.
- A source of fibre: grass can help his digestion along if his diet is short on fibre.
- Digestive discomfort: some dogs eat grass when their stomach feels unsettled.
In most cases, eating a bit of grass now and then poses no problem at all for a healthy dog.
My dog eats grass and vomits: is that normal?
This is the big question. Your dog occasionally eating grass and then being sick is usually a natural mechanism: the blades he swallows irritate the stomach wall and help him bring up something that isn't sitting well. Afterwards he typically settles down and carries on with his day as if nothing had happened.
That said, if your dog eats grass and vomits often, if the vomit is repeatedly yellow or if it comes with listlessness, it is worth paying attention. An isolated episode isn't a concern; repetition is.
When to worry about a dog eating grass
Speak to your vet if you notice any of these signs:
- He eats grass in a compulsive, desperate way, as though he can't stop.
- He vomits several times a day or the vomit is repeatedly yellow.
- He loses his appetite, seems low or has diarrhoea.
- He is eating grass in areas that may have been treated with weedkiller or pesticides.
- He is losing weight with no obvious reason.
In these cases, eating grass may be a symptom of a digestive problem or a nutritional gap worth investigating.
How to stop your dog eating so much grass
If you want to reduce the behaviour, try these simple tips:
- Review his food: a complete, good-quality food with the right amount of fibre reduces the urge to go looking for it outside.
- Tackle the boredom: more walks, play and mental stimulation. An anti-stress slow feeder keeps him busy and makes his food last longer. There are more ideas in our guide on how to entertain a dog at home.
- Avoid areas with chemicals: keep your dog away from gardens or parks treated with weedkiller.
- Don't tell him off: punishment doesn't work; it is better to redirect his attention with a toy or a cue.
So should I let him eat grass?
In a healthy, wormed dog with no symptoms, eating a little clean, untreated grass is harmless. What matters is keeping an eye on how often it happens, on your dog's general condition and on whether the area is free of toxic products. If all of that checks out, there is no cause for alarm.
Remember: with any sudden change in behaviour or symptoms that keep recurring, your vet is always the best point of reference. And if you are looking for accessories to make your companion's day-to-day happier, take a look at our selection of pet products.