23/09/2026
Grass eating is one of those behaviours we’ve become very quick to diagnose.
Nausea. Fibre deficiency. An upset stomach.
But the research suggests a much more nuanced picture.
In a study of 1,571 plant eating dogs, only 9% were frequently reported to appear unwell beforehand, and only 22% frequently vomited afterwards.
Another controlled study recorded 374 grass eating events with only 2 episodes of vomiting. Interestingly, when researchers induced a mild diarrhoeal GI disturbance, the dogs actually spent less time eating grass.
There are other interesting pieces to the puzzle too. Dogs readily eat grass even when healthy, their grazing appears to be influenced by hunger and time of day, and one published case suggests dietary fibre may influence the behaviour in some dogs.
But none of this gives us one universal explanation.
For me, the more useful question isn't “Does my dog eat grass?”
It's “Has something changed about the way my dog is eating grass?”
Sometimes it may be worth investigating.
Does grass eating mean something? Maybe.
Do we know exactly why dogs do it? Not yet.
Studies referenced:
Sueda, Hart & Cliff, Applied Animal Behaviour Science, 2008.
Bjone, Brown & Price, Recent Advances in Animal Nutrition in Australia, 2007.
McKenzie, Brown & Price, Applied Animal Behaviour Science, 2010.
Kang et al., Journal of Veterinary Medical Science, 2007.
[Dog grass eating, Why dogs eat grass, Can dogs eat grass, Canine behavior, Dog health, Dog digestion, Canine gut health, Dog nutrition, Dog behavior, Pet health]