Why Do Dogs Eat Grass? The Surprising Truth Behind This Common Behaviour
Dogs eating grass is a common behaviour that has intrigued pet owners and veterinarians alike. While the exact reasons remain uncertain, several theories—supported by scientific studies and expert observations—offer insights into this behaviour.
🐾 Common Reasons Dogs Eat Grass
1. Natural Instincts from Ancestry
Dogs may have inherited the tendency to eat grass from their wild ancestors. Research indicates that wild canines, such as wolves, often consume plant material, possibly to help purge intestinal parasites. This behaviour might be an innate predisposition in domestic dogs. Source: Psychology Today
2. Dietary Fibre Needs
Grass contains fibre, which can aid in digestion. Some dogs might eat grass to supplement a fibre-deficient diet. In one case, a dog with a history of grass-eating and vomiting ceased this behaviour after being switched to a high-fibre diet. Source: PetMD
3. Enjoyment of Taste or Texture
Dogs are curious creatures by nature, and it’s not uncommon for them to experiment with different tastes and textures. For some dogs, the taste of grass can be appealing, and they might eat it as a form of exploration or simply because they find it delicious. Source: Berthoud Animal Hospital
4. Boredom or Anxiety
Dogs lacking mental stimulation or experiencing anxiety may eat grass as a coping mechanism. Providing adequate exercise, interactive toys, and companionship can help mitigate this behaviour. Source: Berthoud Animal Hospital
5. Attention-Seeking Behaviour
If dogs notice that eating grass garners attention from their owners—whether positive or negative—they might repeat the behaviour to elicit a response. Source: Fun Paw Care
🤢 Does Grass-Eating Cause Vomiting?
A common belief is that dogs eat grass to induce vomiting when they feel unwell. However, studies have shown that this is not typically the case. In a survey, only about 22% of dogs vomited after eating grass, and merely 9% showed signs of illness beforehand. Source: Psychology Today
⚠️ Potential Risks
- Chemical Exposure: Grass treated with pesticides, herbicides, or fertilisers can be toxic to dogs.
- Parasites: Grass contaminated with faeces from other animals can expose dogs to parasites like roundworms or hookworms. Source: AKC
- Gastrointestinal Blockages: Large amounts of grass, especially if swallowed whole, may cause blockages. Source: PetMD
🩺 When to Speak to Your Vet
Contact your vet if your dog:
- Eats grass excessively or compulsively
- Vomits regularly after eating grass
- Shows signs of illness such as lethargy or appetite loss
- If you’re concerned at all
- Has eaten grass that may have been treated with chemicals
A check-up can rule out dietary issues or gastrointestinal problems and help address any behavioural concerns.
✅ Key Takeaways
- Most dogs eat grass occasionally – and it’s usually nothing to worry about.
- Reasons include instinct, fibre needs, taste, boredom, or attention-seeking.
- Always supervise where they graze to avoid toxins or parasites.
- Consult a vet if the behaviour becomes excessive or is paired with other symptoms.
Understanding why your dog eats grass can help you support their health and happiness. As always, when in doubt, talk to your vet.
To prevent your dog from being bored, or to give your dog alternative activities to do outside, why not check out our events page and find a fun activity to engage in with your dog.
