Why is my dog eating grass?
It is incredibly common for dogs to munch on grass, but it often leaves pet parents wondering why. While it might seem like strange behaviour, eating grass is actually a very normal canine habit.
Here are the most common reasons why your dog might be grazing, and when you should consider a chat with your vet.
1. It tastes good (especially in spring and summer)
Believe it or not, many dogs simply enjoy the taste and texture of grass. During the warmer months, new grass shoots are fresh, crisp, and surprisingly sweet. If your dog is happily grazing during a walk, they might just be enjoying a tasty snack - or they might be thirsty and looking for a quick hydration boost from the dew or moisture on the blades.
2. Instinct and boredom
Dogs are natural scavengers. Sometimes, a dog will chew on grass simply out of instinct, to pass the time if they are feeling a little bored, or to get your attention.
3. Does it mean my dog is sick or lacking nutrients?
As a general rule, grass-eating is not an indication of a nutritional deficiency or a lack of vitamins in their diet. There’s even a theory dogs eat grass to deliberately make themselves throw-up when feeling nauseous or ill (like if they have worms). There’s evidence of various wild animals self-medicating this way, so there might be some evolutionary basis for this behaviour.
Is it safe for dogs to eat grass?
In most cases, yes. Eating grass is harmless. However, you should try to stop them if:
The grass has been treated: Lawns treated with chemical fertilizers, pesticides, or weedkillers can be toxic.
There are slugs or snails around: Lungworm is a serious parasite passed on by slugs and snails, which can easily be accidentally swallowed while a dog is eating grass.
Tip: Always ensure your dog has access to a bowl of fresh, cold water, especially after a walk where they've been snacking on grass.
When to speak to a vet
While occasional grazing is nothing to worry about, you should contact your vet if you notice any of the following:
Your dog is eating grass compulsively or excessively.
They seem unwell, lethargic, or anxious before or after eating it.
They are vomiting repeatedly after eating grass.
They are refusing their normal food but eating large amounts of grass.
Want to learn more?
For a deeper dive into your dog's grazing habits, check out our full, in-depth guide on the Tails.com Blog: Why Do Dogs Eat Grass?