Why Your Dog Keeps Eating Grass (And What They Might Be Telling You)

If your dog makes a beeline for the nearest patch of grass every time you let them out, you've probably Googled this at least once. And you probably got a dozen different answers.

"It's normal." "They're bored." "They like the taste." "They're trying to make themselves sick."

Some of that is true, some of it isn't, and none of it really helps. So let me break down what's actually going on, because in my experience, grass eating is one of the clearest signals your dog can give you that something in their gut isn't right.

It's more common than you think

First off, you're not imagining it and your dog isn't strange. Studies have found that around 79% of dogs with regular access to grass eat it at some point. It's been observed in wild dogs too, so there's likely a natural instinct behind it.

But "common" and "nothing to worry about" aren't the same thing. When a dog goes from the occasional nibble to eating grass regularly, especially first thing in the morning or straight after meals, that's a pattern worth paying attention to.

What's actually driving the behaviour

There are a few reasons dogs eat grass, and they're not all the same.

Digestive discomfort. This is the one I see most often. Dogs with low-level nausea, excess stomach acid, or general gut irritation will seek out grass instinctively. It's not that they're trying to make themselves sick. It's more like their body is looking for something to settle things down. The grass provides a small amount of fibre, and the physical act of chewing and swallowing can temporarily ease that discomfort.

Nutritional gaps. Dogs on highly processed diets can be missing key nutrients, even if the label claims the food is "complete". Fibre is a big one. So are certain vitamins and minerals like zinc, B vitamins, and vitamin C. When the body senses something is lacking, the instinct to forage kicks in. Grass isn't going to fill those gaps, but your dog doesn't know that.

Gut microbiome imbalance. This is the one that ties it all together. Around 80% of your dog's immune system lives in the gut, and the bacterial balance in there affects everything from digestion to mood to skin health. When the microbiome is out of balance, it can cause the kind of low-grade digestive discomfort that drives grass eating in the first place. It can also affect how well your dog absorbs nutrients from their food, creating deficiencies even on a reasonable diet.

The pattern I see over and over

A dog parent contacts me because their dog eats grass every morning. They've been to the vet, nothing obvious came up, and they've been told it's just "a dog thing".

When I dig into the details, there's almost always more going on. The dog's stools aren't quite right. Maybe a bit soft, or inconsistent. There might be some gurgling after meals, or the occasional vomit that everyone writes off as normal. Sometimes there's itchy skin or dull coat as well.

These aren't separate problems. They're all connected to gut health. The grass eating is just the most visible one.

Why the grass itself can be a problem

Even if the behaviour is natural, the grass your dog is eating might not be safe. Public parks and gardens are often treated with pesticides, herbicides, and fertilisers. Your own garden might have been treated too, or a neighbour's chemicals could have drifted across.

Dog waste from other animals also contaminates grass, which can expose your dog to parasites. So while the instinct to eat grass might be harmless, what's on the grass often isn't.

What I'd focus on first

When a dog parent comes to me with a grass-eating dog, I start with the gut. Every time.

If the gut bacteria are out of balance and the digestive environment isn't right, everything else is just symptom management. You can stop your dog eating grass by keeping them on a lead or distracting them, but the discomfort that's driving the behaviour is still there.

Supporting the gut means giving the digestive system what it needs to function properly. That's why I created our Gut Health supplement. It's designed to help support the gut lining and digestive function, working alongside a balanced diet to create the right environment for your dog's gut to do its job.

A lot of our customers tell me the grass eating reduced or stopped completely within a few weeks of starting on it. I can't guarantee that for every dog, because every dog is different. But when you address what's driving the behaviour rather than just the behaviour itself, the results tend to follow.