Why Do Dogs Eat Grass?!

Have you ever (like me) been puzzled by your dogs desire to inelegantly knaw on grass?

The behaviour raises a number of questions: Is it normal? Is your dog unwell? Or is there another reason behind this often-confounding habit? In this blog post, we’ll dive into the reasons why dogs may eat grass and what it might mean for their health and well-being.

Is Grass Eating Natural for Dogs?

This may come as a surprise to many, but yes it can be! Dogs are omnivores by nature, which means their diet can include both animal proteins and plant matter.

Many experts believe that grass eating is an instinctual behaviour, inherited from the wild ancestors of modern dogs, who would consume the stomach contents of their prey—often filled with plant materials. This behaviour suggests that, for many dogs, grazing is part of a holistic dietary approach, and even a form of zoopharmacognosy, which is the practice of ingesting plants to self medicate.

Zoopharmacognosy has been observed in many species, to include chimpanzees, birds and cows.

A dog indulging in some free food!

Why do dogs eat grass?

1.1 Nutritional benefits

Interestingly, grass eating is especially common in the spring, which is when the grass is high in vitamins, minerals, proteins and other nutrition. Dogs do not have all of the digestive components to fully digest this kind of plant matter, hence why It often comes out the other end relatively whole (and with difficulty). However, morning dew can hydrolyse (break down) grass proteins overnight, which makes the cellulose, or the part dogs struggle to digest more fragile. Thus, there is potential for dogs to receive more nutritional benefit from consumption at this time!

Its not just grass dogs will often munch, with some seeking other plants like herbs, which further supports the theory of self medication. Some nutritional experts recommend planting your own grass/herbs etc in the garden for dogs to forage ad-lib. To include: Milk thistle, German chamomile, burdock, Horsetail, peppermint, and controversially, garlic grass!

1.2 Gastrointestinal issues

Probably the most prevalent theory regarding grass eating relates to digestive issues.

Some dogs will chew on grass when they feel digestive discomfort or nausea, perhaps with the intent to induce vomiting to relieve digestive upset. It may also be an attempt to supplement nutrients or fibre missing from their diet. A diet lacking in fibre will often present as loose, irregular stools. Because of its 'bulking' ability, some suggest eating grass may also be a way of flushing out digestive parasites such as worms, as observed in primates.

1.3 Behavioural components

Dogs are highly social animals, whom are fantastic at observing their owner's reactions closely. If you tend to react strongly when your dog eats grass—whether it's a shout of disapproval or concerned questioning— there is possibility for your dog to associate grass eating with attracting your attention.

Boredom can also drive dogs to munch on grass (amongst other more non-consumable items). Dogs require physical and mental stimulation to keep them happy. If a dog isn’t getting enough exercise or enrichment, they might resort to eating grass out of boredom.

Similarly, dogs suffering from anxiety may also exhibit this behaviour. Grass eating can serve as a coping mechanism, offering them a form of distraction or comfort. If you suspect that your dog’s grass eating is linked to boredom or anxiety, finding ways to engage their minds and bodies through play, training, or social activities may help reduce the behaviour. Better yet, consult a behaviourist!

When to Be Concerned

While occasional grass eating is typically harmless, there are instances where it might indicate a more serious issue. If your dog frequently consumes grass and shows signs of distress—such as continuous vomiting, lethargy, or a change in appetite—it is essential to seek veterinary advice.

Certain types of grass or herbicides used on lawns may also be harmful to dogs. It’s crucial to ensure that any grass your dog has access to is free from pesticides or other chemicals that could pose a risk. Beware of ticks and grass seeds, which are common in longer grasses.

Conclusion

Understanding why your dog eats grass can shed light on their health and well-being. Whether it’s just an instinctive behaviour, a response to digestive discomfort, boredom, or even nutritional deficiency, being aware of the underlying causes can help give you peace of mind that they're healthy and happy!

If you have concerns about your dog's grass-eating habits, a conversation with a professional such as a vet, nutritionist or behaviourist may be necessary, as they can provide clarity and guidance tailored to your pet’s needs. Always keep an eye on your dog's behaviour and health, and don’t be afraid to explore new options!