Why do cats eat grass?

Cats have a reputation for being finicky eaters, but one common behavior that many cat owners have observed is their tendency to eat grass. While this behavior may seem unusual, it is actually quite common and may have important implications for a cat’s health and well-being. In this article, we will explore the reasons why cats eat grass, including historical, evolutionary, physical, and psychological factors. We will also discuss potential dangers associated with grass consumption and offer tips for safely incorporating grass into your cat’s diet.

Historical and evolutionary reasons for cats eating grass

Cats have been domesticated for thousands of years, but their wild ancestors were obligate carnivores, meaning that they relied solely on a meat-based diet. However, wild cats were known to eat small amounts of grass, and this behavior has been passed down to their domesticated counterparts.

One theory is that cats’ consumption of grass is an evolutionary adaptation to aid digestion. In the wild, cats would consume the entire prey animal, including its stomach contents, which often included plant matter. Eating grass may help to stimulate digestion and move food through the digestive system.

Additionally, grass contains important nutrients and vitamins, such as folic acid, that may be beneficial to cats. By consuming grass, cats may be seeking out these essential nutrients that may be lacking in their diet.

Overall, it is likely that cats’ consumption of grass is a natural behavior that has been inherited from their wild ancestors and may serve important digestive and nutritional functions.

Physical reasons for cats eating grass

In addition to the potential nutritional benefits, there are several physical reasons why cats may eat grass:

  1. Stimulation of vomiting reflex: Cats are known to groom themselves frequently, which can lead to the ingestion of hairballs or other irritants. Eating grass may help to stimulate the vomiting reflex, allowing cats to expel these irritants from their system.
  2. Regulation of digestive system: Grass contains fiber, which can help to regulate a cat’s digestive system. Eating grass may help to alleviate constipation or diarrhea, as well as prevent the buildup of hairballs in the digestive tract.
  3. Dental care: Chewing on grass can also help to promote dental health in cats. The abrasive texture of grass can help to scrape away plaque and tartar buildup on teeth.

While the exact reasons why cats eat grass may vary, these physical benefits may contribute to the behavior.

Psychological reasons for cats eating grass

While cats may eat grass for physical reasons, there may also be psychological factors at play. Some potential reasons why cats may eat grass for psychological reasons include:

  1. Boredom or curiosity: Cats are curious creatures and may be attracted to the texture and taste of grass. Eating grass may provide a new sensory experience for them.
  2. Stress relief or anxiety management: Some cats may eat grass as a way to relieve stress or anxiety. This may be particularly true for indoor cats, who may not have access to other forms of enrichment.

While it is difficult to determine the exact psychological motivations behind a cat’s grass consumption, it is important to consider the possibility that psychological factors may play a role. Providing plenty of enrichment and environmental stimulation may help to alleviate boredom and reduce stress in cats.

Potential dangers of cats eating grass

While grass consumption may have some benefits for cats, there are also potential dangers to consider:

  1. Pesticide exposure: If the grass has been treated with pesticides or other chemicals, eating it could lead to toxicity or illness in cats.
  2. Ingestion of foreign objects: If the grass is contaminated with foreign objects, such as small rocks or pieces of plastic, these objects could become lodged in a cat’s digestive system and cause harm.
  3. Indigestible plant matter: Some types of grass, such as Bermuda grass or St. Augustine grass, contain indigestible plant matter that can cause digestive upset or intestinal obstruction in cats.
  4. Toxic plants: Some plants, such as lilies or daffodils, are toxic to cats and can cause serious illness or even death if ingested.

It is important to monitor your cat’s grass consumption and ensure that any grass they eat is free of pesticides and other contaminants. Providing safe, indoor plants for your cat to nibble on, such as cat grass or wheatgrass, may be a safer alternative.

How to safely incorporate grass into your cat’s diet

If you want to provide your cat with grass to munch on, there are several ways to do so safely:

  1. Grow your own cat grass: You can purchase seeds for cat grass or wheatgrass and grow them in a pot indoors. This ensures that the grass is free of pesticides and other contaminants.
  2. Provide safe, indoor plants: There are several indoor plants that are safe for cats to nibble on, such as spider plants, catnip, and catmint.
  3. Avoid outdoor grass: If your cat has access to outdoor grass, make sure that it is free of pesticides and other contaminants before allowing your cat to eat it.
  4. Monitor your cat’s consumption: While grass may be safe for most cats, some cats may have sensitivities or allergies to certain types of grass. Monitor your cat’s consumption and watch for any signs of digestive upset or other adverse reactions.

By following these guidelines, you can safely incorporate grass into your cat’s diet and provide them with a safe and healthy way to satisfy their natural urge to munch on greens.


In conclusion, while the exact reasons why cats eat grass may vary, it is likely that this behavior has both physical and psychological motivations. Grass consumption may aid in digestion, dental health, and stress relief, but it is important to monitor your cat’s grass consumption to ensure their safety. If you have concerns about your cat’s grass consumption or any other behaviors, it is always best to consult with your veterinarian to ensure your cat’s health and well-being.

Leave a Comment