I have had a number of clients concerned that their dog or cat eats grass sometimes on a daily basis and they are concerned that there is something wrong with their pet.
Often, they tell me that it they think it is to make their dog or cat sick and they see evidence of the undigested grass either in their pet’s vomit or the other end when they pick up their dog’s poo on a walk.
I take Ruff out every morning and watch him eat the dew off the grass and the long blades of grass almost every morning – he loves grazing like a cow!
There are two main types of canine grass eating. The first is simple grazing where your dog happily munches on grass and suffers no ill effects.
Sometimes it may be to make up for a nutritional deficiency but even dogs that eat well balanced diets will eat grass. It’s possible that they simply like the taste and the sensation. It’s like a fresh salad to them. So even if you’re feeding your dog well, they might still fancy some greens!
Instinctive vomitting behaviour
The other type of grass eating is when a dog eats some grass and throws it up. This is thought to be a deliberate instinctive attempt to induce vomiting after they’ve swallowed something that makes them feel ill or disagrees with them.
Dogs that eat to make themselves vomit usually swallow grass as quickly as possible, barely even chewing it. It is believed that the long, unchewed pieces of grass stimulate their throats to bring on the vomiting reaction.
If your dog eats grass then vomits and seems fine, they have probably instictively taken care of whatever their intolerance was.
Parasites could be another reason
A team at the University of California, Davis, School of Veterinary Medicine believe that regular plant eating by our pets is a reflection of an innate predisposition of regular plant eating by wild ancestors, which is supported by numerous reports of wild carnivores eating plants, as shown mostly by the non-digestible grass and other plant parts seen in their scats (the researchers name for poo!)
Studies on primates have revealed non-digestible plants purge the intestinal system of worms and other parasites.
Given virtually all wild carnivores carry an intestinal parasite load, regular, instinctive plant eating would have an adaptive role in maintaining a tolerable intestinal parasite load, whether or not the animal senses the parasites.
The findings were presented at the annual Congress of the International Society for Applied Ethology in Bergen, Norway.
As reported in the journal Science, the team’s advice is to buy or grow some indoor grass for cats to chew on. This will give them a chance to exercise this innate behaviour with a safe source of non-poisonous plant life.
I happily allow Ruff to be a cow-dog and fulfil his ancestral instincts on our morning walks even though he is regularly wormed😊

Hunny the Viszla had severe diarrhoea
My husband just said to me this morning – I cannot believe how well Hunny is. Her coat is better, she has more energy and she is a happier pup
Be part of our vegan dog food education journey
Help us to educate the public about plant-based feeding in dogs and you’ll get a FREE thank you goodie bag for your dog!
Vet’s Dachshund just LOVES Solo Vegetal!
All my fears and anxieties of having a stand at VetFest were unnecessary as Solo Vegetal stole the show
Maisy the rescue just LOVES her vegan diet
8 years of successfully feeding a vegan dog food diet and Maisy just loves it!
Louie the active Sprocker loves baguettes!
His weakness for bread and baguettes resulted in him suffering from a case of pancreatitis
Why I am investing in you as you give me hope!
I am cashing in my pension for you as you give me such hope for the future – this post is very personal but I feel it needs to be shared with you
Pets At Home sell plant-based dog food!
Pets at Home own brand Wainwrights launch a plant-based tinned and dry dog food in their stores
Dora the Newfypoo was raw fed and now adores her vegan diet!
We all need a Dora in our lives – her optimism and love of life and her vegan dog food fills us all with such hope!
Gentle giant Drake’s life transforms on a vegan diet
Since starting on a homecooked wholefood vegan dog food diet, Drake’s life changes dramatically for the better!
Moss has a calming effect on his meat-eating brother
Moss shows no interest in his brother’s food, whereas his brother is very keen to get Moss’ vegan food!
12 year old Mastiff Troy’s astounding transition from raw to vegan dog food
Troy was fed a raw food diet all his life but at the age of 12, he transitioned to vegan dog food and the changes seen are astounding!
My biggest regret is not switching Nero to vegan food sooner
Just try it…My biggest regret is not switching Nero’s diet to a plant based diet sooner