Why do dogs eat grass?

Have you ever caught your furry friend munching on a patch of grass during your daily walk? It's not an uncommon sight to see dogs eating grass, but have you ever wondered why they do it?

There are several theories as to why dogs eat grass. Some experts suggest that it's a natural behavior inherited from their wild ancestors, who relied on plants for nutrients. Others believe that it's a sign of a nutritional deficiency in their diet, while some suggest that it's simply a means to an end-- dogs eat grass to induce vomiting.

Despite the lack of a definitive answer, let's delve deeper into the reasons behind why dogs eat grass.

Natural Instincts

Dogs are descendants of wild canids, such as wolves and foxes, who were known to eat grass and other vegetation as part of their diet. This natural behavior passed down through generations, and pet dogs still exhibit the same behavior today.

In the wild, dogs would eat entire plants, including roots and leaves, to obtain essential nutrients such as fiber and vitamins. Since dogs have a predominantly carnivorous diet, their intake of plant-based nutrients is limited, and eating grass is a way to supplement their diet.

Nutritional Deficiencies

Another theory relating to dogs eating grass is that it's a sign of a nutritional deficiency in their diet. If your furry friend is not receiving the necessary nutrients from their food, their body may crave these nutrients from other sources, including grass.

For example, if a dog lacks fiber in their diet, they may be more likely to eat grass to fulfill that need. Similarly, if a dog is deficient in vitamins, such as A, K, and C, they may seek out vegetation that contains these vital nutrients.

Soothing an Upset Stomach

One of the most widely accepted theories as to why dogs eat grass is that they do so to relieve an upset stomach. Eating grass can induce vomiting, which can help dogs to clear their digestive system of any harmful substances that they may have ingested.

Research suggests that many dogs tend to eat grass right before vomiting. However, this does not necessarily mean that the grass caused the vomiting, but rather that the dog ate the grass to alleviate the discomfort before vomiting.

Natural Cleansing

Another theory suggests that dogs eat grass to cleanse their digestive system naturally. Grass contains roughage, which acts as a natural laxative, helping to promote bowel movements and improve digestion.

Similar to fiber, if a dog is not receiving enough roughage in their diet, they may seek out grass to help them digest their food better and maintain regular bowel movements.

Suitable or Harmful?

Now that we've explored why dogs eat grass let's address whether it's safe or not for your pet.

Experts suggest that eating grass is not harmful to your dog, as long as it's consumed in moderation and the grass is free of harmful chemicals, pesticides, or herbicides.

However, it's essential to monitor your dog's behavior and intake of grass, as excessive consumption may lead to vomiting, diarrhea, or an upset stomach. Moreover, some species of grass, such as foxtail, can cause serious health problems if ingested, so make sure to keep an eye out for any signs of discomfort or distress.


In conclusion, there is no definitive answer as to why dogs eat grass, and the behavior is likely driven by a combination of natural instincts, nutritional deficiencies, and natural cleansing. Ultimately, eating grass may be a natural and healthy behavior for most dogs. However, if you have any concerns about your pet's grass-eating habits, it's essential to consult your veterinarian to rule out any underlying health issues.