Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Why Do Cats Eat Grass? 5 Vet-Reviewed Reasons Behind the Behavior

close up of a cat eating grass

Our beloved cats are quirky creatures with some habits that seem rather baffling to cat owners. One of these behaviors is cats chowing down on grass and then sometimes throwing it back up. Why? Why on earth do these intelligent and sensitive mammals eat grass only to throw it up again? Well, rest assured, we will answer this question and explore the reasons behind this peculiar cat behavior.

However, before we launch into the whys, we would like to start by reassuring you that eating grass is not harmful and is thought to possibly be beneficial for your cat, and many cats enjoy it. However, make sure your grass is not treated with any chemicals, and remove all toxic plants from your home.

Let’s dig deeper into some of the possible causes why cats like eating grass, while also demystifying previously believed reasons for this particular habit.

divider single cat paw oct 2024

The 5 Possible Reasons Cats Eat Grass

1. Instinct Sometimes Accompanied By Throwing Up

Cats are classified as obligate carnivores, which means they need to eat meat to survive. In fact, they don’t have the right digestive enzymes to metabolize vegetation, so adding vegetables to a cat’s diet isn’t doing them any favors.

Because of their inability to digest the grass, some cats may throw up, which will also expel any indigestible material – bones, feathers, hairballs, all of which might make your cat feel ill.

Today, we know that only a quarter of cats actually end up vomiting after eating grass, and the majority of cats do not seem sick in any way before ingesting grass.1 Eating grass is an instinctual behavior that most cats like to partake in.

cat on grass field
Image By: Michael Berger, Pixabay

2. The Purge

Scientists now also believe that this instinct may come with an added evolutionary benefit. Your cat might also seek out grass to intentionally dispel excess fur or even parasites, such as worms, through their other end. Grass might add extra bulk and fiber to their diet, which can act as a natural laxative and could potentially help your cat get rid of unwanted visitors.

Fiber from the grass can be beneficial to your cat’s digestive system and help in managing furballs in some cases.


3. Added Vitamins

Grass contains folic acid (vitamin B9) when it’s broken down (essentially, chewing grass releases the folic acid in the “grass juice”). It’s essential for keeping red blood cells healthy, and if there isn’t enough folic acid in the body, anemia could occur.

Some cats really seem to like the taste of grass, and this may be due to folic acid, but we cannot know for sure. If you suspect that your cat may be lacking in folic acid or other vitamins and minerals, speak to your vet before attempting to treat the condition at home, as too much of any beneficial or essential ingredient can be harmful for their health.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money


4. It’s a Matter of Taste

In some cases, it could just be that your cat is enjoying the feel and taste of the grass in their mouth. They may like the texture, and some cats will nibble at grass and other plant material from boredom and curiosity.


5. Health Reasons

If your cat regularly eats grass in excess or other non-food items, they might be showing signs of underlying health issues, anxiety, or stress. Some cats exhibit signs of stress by over-grooming or excessive meowing, or they turn to chew on inappropriate and less-edible items as a way of self-soothing. If you have a cat that is indoors-only, be sure your houseplants are not toxic or they are placed in areas that your cat cannot access, as they might try to chew on your plants.

If your cat only eats grass once in a while and they have been doing it for years in moderation, it typically isn’t anything to worry about. However, if it seems to be a frequent occurrence (several times a day or multiple days a week), or it’s accompanied with any signs of stress or ill health, such as reduced appetite, vomiting, diarrhea, weight loss, or other, be sure to take them to your vet to help rule out any health issues. You can also work with your vet to help your cat if you believe they have stress or anxiety problems.

divider cat paw scratch oct 2024

Cause for Concern

As you can observe from this list of reasons why your cat may be eating grass, it isn’t typically something to be overly concerned about. Having said that, it is recommended that growing your own cat grass is safer as it’s organic and won’t contain any herbicides or pesticides. And of course, there’s always the entertaining catnip.

If your cat eats grass that you know has been chemically treated, or if you aren’t sure, consult with your vet straight away rather than wait for signs of toxicity, oral irritation, or digestive upset to occur.

divider cats oct 2024

Conclusion

So, we’ve gone over the most common possibilities of why your cat might be eating grass. They are probably just enjoying the taste and texture, exhibiting their natural instinctive behavior, all while supporting the digestive system or purging themselves of indigestible items. They might be looking to add folic acid to their diet, or if they are eating grass excessively, it may be a sign of underlying health issues or stress.

Since experts can’t actually ask cats why they do these behaviors, we will never truly know or understand why they occur. However, if you are concerned about your cat’s physical or mental health, take them to your vet. Overall, grass-eating in moderation isn’t anything to be worried about, but as long as you keep an eye on your cat, their appetite, and their behavior and consider growing some cat grass, your beloved pet should be just fine.

You might also like:


Featured Image: mowli, Pixabay

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.


How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Can Cats Eat Pecans? Vet-Approved Facts & FAQ

Cat owners around the world know that they must be careful about where they leave food lying around. Felines can jump up onto...

Can Cats Eat Lettuce? Vet-Verified Benefits & Precautions

Cats may be true carnivores, but their curious nature attracts them to all types of human food, including greens. Lettuce is a popular...

Cat Mouth Sore: Causes, Signs & Treatments (Vet Answer)

Have you noticed your cat has a mouth sore that seems to be lasting longer than your average cut or graze? Your cat...

Is Baby Powder Safe for a Cat? What You Need to Know! Vet-Approved Safety Info

It has been common practice for groomers and cat owners to dust cats with baby powder, as it can leave the fur soft...

More related

Is Cat Pee Toxic or Can It Make You Sick? Vet Verified Health Facts & FAQ

Before bringing a cat into your home, there are several factors to consider. Not only should you be confident that you can care...

Are Russian Blue Cats Hypoallergenic? Vet-Verified Breed Facts & FAQ

Just because you suffer from cat allergies doesn’t mean you don’t like cats. It’s a cruel twist of fate that you could be...

National Cat Day 2026: Everything You Need to Know

Every day is a day to celebrate our feline companions, of course. After all, they bring so much entertainment, love, and excitement into...

Egyptian Mau vs. Tabby Cat: The Differences (With Pictures)

When choosing a new cat for your home, tabby cats and Egyptian Mau cats make wonderful choices since both are friendly, intelligent, and...

Keep reading

Where Do Cats Like to Sleep? 5 Typical Places

If you are a cat owner, you know how much cats love to sleep. Most cats sleep up to 16 hours a day, and when choosing a place to sleep, most indoor cats love their particular sleeping spots. According to...

grey cat sleeping in bed beside a person's foot

Why Do Cats Like Their Butt Patted? 7 Vet-Reviewed Reasons

No matter how much we love them, no one can deny that cats can do strange things. They are daredevils that enjoy high places. They fixate on the smallest things and can sit there for hours, seemingly staring at nothing....

cat wearing fabric collar looking camera and lying on the pillow when owner hand patting back

Yeast Infection in Cats (Malassezia Dermatitis): Our Vet Discusses Signs, Causes & Treatment

Your cat is losing hair and, quite honestly, smells like corn chips. You know it’s not normal, so you call your veterinary hospital to schedule an appointment. Your head is spinning after your veterinarian suggests a skin impression and diagnoses...

vet examining red sore ear of a cat

Can Cats Eat Roast Beef? Vet Reviewed Benefits & Concerns

It is difficult to ignore the urge to spoil our pets. After all, we do it all the time for ourselves, so we want to give our lovely cat a tasty treat from our plate. But before you give human...

Can Cats Eat Roast Beef

7 Best Kitten Foods in Canada of 2026 – Reviews & Top Picks

Canada is not only a country known for its awe-inspiring landscapes and welcoming people, but it’s also a great place to find some of the best brands of cat and kitten food in the world! Indeed, Canadian brands are renowned...

cat eating chicken dinner

Why Does My Cat Keep Meowing? 7 Reasons Why They Won’t Stop

Meowing is one of your cat’s main sources of communication with you. Most meows are harmless and hearing them is a normal part of your day. But if your cat is meowing excessively, you may wonder why. Read on to...

cat meowing or chirping by the window

How Much Does a Cat Blood Test Cost? 2026 Pricing Guide

If the vet recommends blood tests, it’s easy to get confused about their purpose. After all, there are many types of blood tests, and on the patient’s end, they all look the same. The vet draws a bit of blood...

blood samples in test tubes

7-12-Month Old Kitten: What to Expect (Vet-Verified Guide)

Most kittens get adopted before they are six months old, meaning that you get to experience the part of a kitten’s life in which they are 7 to 12 months of age. This is the stage where kittens are self-sufficient...

Australian Mist Kitten