A dog eating grass and leaves is a peculiar behavior, which is surprisingly common and often harmless, but in some cases, it can point to underlying issues that require your attention.
Dogs might nibble on grass or chew on leaves for a variety of reasons—ranging from instinctual behaviors and dietary needs to boredom or gastrointestinal discomfort.
We break down the causes of why dogs eat grass and leaves, what you should watch for, and when to see your veterinarian.
Table of Contents
Here’s Why Dogs Eat Grass and Leaves
Dogs may eat grass and leaves for various reasons, including boredom, dietary deficiencies, digestive relief, or simply because they enjoy the taste and texture. In many cases, this behavior is instinctual and harmless, especially if it’s occasional and not accompanied by vomiting or other symptoms.
Some dogs turn to grass and leaves to induce vomiting when they feel unwell, while others may be trying to supplement a fiber-deficient diet.
Common Reasons For Dog Eating Grass and Leaves
1. Instinctual Behavior
The most widely accepted reason dogs eat grass and leaves is due to instinct. This behavior dates back to dogs’ wild ancestors.
Wild canines, like wolves, are known to consume plant material.
It’s believed that grass and leaves served as a natural digestive aid, helping to expel parasites and induce vomiting when needed.
If you’re wondering why your dog is eating grass and leaves but seems perfectly fine afterward, it might simply be their way of “cleaning out” their digestive system—an inherited survival strategy.
Related: Dog eating grass and not eating (Here’s why)
2. Dietary Deficiency or Nutritional Imbalance
Another common reason your dog is eating grass and leaves is due to a lack of certain nutrients in their diet.
Dogs might instinctively consume greens when they feel they’re missing fiber, minerals, or other essential nutrients.
This is especially common in dogs that are fed low-quality kibble or highly processed diets.
In such cases, the dog’s body may be pushing them to supplement their nutrition by seeking fiber or micronutrients found in grass and leaves.
If your dog is consistently eating plant material, it may be time to evaluate their food.
Switching to a high-quality, balanced diet or one with added fiber may curb the urge.
3. Boredom or Behavioral Habits
Sometimes, dogs eat grass and leaves out of boredom or habit—especially when they’re left alone in the yard or lack sufficient mental and physical stimulation.
This is often seen in high-energy breeds or puppies that need constant activity. Chewing leaves or nibbling grass may become a form of self-entertainment.
If you suspect this is the cause, adding more interactive toys, training, or exercise to your dog’s daily routine can reduce the behavior.
4. Upset Stomach or Nausea
One of the most cited reasons dogs eat grass and leaves is to soothe an upset stomach or induce vomiting.
Grass blades can tickle a dog’s throat or stomach lining, triggering them to vomit.
If your dog eats grass rapidly and then throws up shortly after, they may be trying to alleviate nausea or discomfort.
While occasional vomiting may not be alarming, repeated incidents could indicate a deeper gastrointestinal issue like gastritis, acid reflux, or a food allergy.
In such cases, consult your vet to rule out digestive problems.
Related: Dog eating grass and not dirt (Here’s why)
5. Pica or Obsessive Behavior
If your dog is frequently eating grass and leaves, especially in large quantities, they may be exhibiting signs of pica—a condition characterized by the compulsive ingestion of non-food items.
Pica can stem from medical or psychological conditions such as:
Nutritional deficiencies
Anxiety or stress
Thyroid imbalance
Neurological disorders
In this situation, it’s important to speak with your vet to determine if your dog has an underlying condition that needs addressing.
6. Curiosity and Taste Exploration
Just like human toddlers, dogs explore the world with their mouths. Puppies, in particular, may eat grass and leaves out of pure curiosity or because they enjoy the taste or texture.
This behavior is usually harmless, especially if the items consumed are small and non-toxic.
Still, it’s important to make sure the plants in your yard or walking route are safe for dogs to prevent accidental poisoning.
7. Anxiety and Stress-Driven Behavior
Much like how humans might chew on their nails, dogs may eat grass and leaves as a stress-relieving activity.
This is more common in dogs with separation anxiety or those facing environmental changes like moving homes, the arrival of a new pet, or loud noises like fireworks.
In these cases, the behavior might be paired with other symptoms such as:
Whining or barking
Destructive behavior
Panting or pacing
Excessive licking or drooling
Addressing the source of stress, behavioral training, or consulting a canine behaviorist can help alleviate the problem.
8. Medical Conditions
Certain medical issues may trigger your dog to eat grass and leaves frequently, especially if they’re experiencing chronic gastrointestinal problems or metabolic disorders.
Conditions such as:
Inflammatory bowel disease (IBD)
Pancreatitis
Hyperthyroidism
Addison’s disease
can alter your dog’s appetite, digestion, and behavior—leading them to seek plant matter to compensate or relieve discomfort.
If your dog’s grass-eating is sudden, frequent, or accompanied by other signs like diarrhea, vomiting, or weight loss, it’s time to call the vet.
Related: Dog eating grass and weeds (Here’s why)
When to Worry
While dogs eating grass and leaves is usually harmless, there are situations where it could be a cause for concern. You should seek veterinary care if:
Your dog is vomiting repeatedly after eating grass or leaves
You notice signs of lethargy, diarrhea, or lack of appetite
Your dog is obsessively eating plant matter
You suspect they’ve ingested toxic plants (e.g., azaleas, sago palms)
Your puppy is eating large amounts of leaves or dirt
Also, be cautious of chemical treatments on grass—fertilizers, pesticides, and herbicides can cause poisoning if ingested.
What to Do
Here are some practical steps to take:
Evaluate their diet – Ensure your dog is eating a high-quality, balanced food with sufficient fiber and nutrients.
Rule out medical conditions – Visit your vet to check for gastrointestinal issues or other health concerns.
Provide mental stimulation – Enrich their environment with toys, games, and exercise to combat boredom.
Monitor outdoor time – Supervise them during walks or in the yard to prevent eating harmful plants.
Identify stress triggers – Observe any changes in their environment or behavior that may indicate anxiety.
Key Takeaway
Dogs eating grass and leaves is a common behavior, and in many cases, it’s not a cause for panic. It could stem from instinct, curiosity, boredom, or minor stomach upset.
However, frequent or excessive consumption of grass and leaves, especially when paired with vomiting or other symptoms, should be investigated by a veterinarian.
Monitoring their overall health and behavior is the best way to ensure your dog stays safe and healthy.
By understanding the reasons behind why dogs eat grass and leaves, you can better support your dog’s well-being and prevent potential complications.
FAQs About Dogs Eating Grass and Leaves
Q: Is it safe for dogs to eat grass and leaves?
A: Generally, yes—but make sure the plants aren’t treated with chemicals or are toxic to dogs.
Q: Should I stop my dog from eating grass and leaves?
A: Occasional nibbling is okay, but discourage it if it becomes excessive or leads to vomiting.
Q: Can eating grass and leaves cause health issues?
A: It can, especially if toxic plants or large amounts are ingested, or if it’s linked to an underlying illness.
Q: When should I see a vet?
A: If your dog shows signs of vomiting, lethargy, diarrhea, or persistent plant-eating behavior.