Dogs in the wild balanced their diets by eating what they huntedall of what they hunted, including meat, bones, internal organs, and stomach contents. Eating an entire animal provided a fairly balanced diet, especially when the preys stomach contained grass and plants that fulfilled the dogs need for fiber.
- A lack of dietary fibre affects the dogs ability to digest food and pass a bowel motion, so grass may be helping their bodily functions. If you suspect the reason your dog eats grass is for dietary requirements, it is worth talking to a vet to help identify any gaps in their nutrition and how to help fill them in a way thats better for your dogs overall wellbeing.

Such details provide a deeper understanding and appreciation for Do Large Breed Dogs Need To Eat Grass.
Although dogs are not strict herbivores, in some cases, grass can help them meet certain biological needs. Grass contains roughage, or dietary fiber, that plays an essential role in a dogs digestion by helping maintain healthy bowel movements ...

- Dogs (and humans) cant actually digest grass so its not the best way for them to get fiber into their diet but they dont know any different so we need to help them out. Generally, a commercial high-fiber diet is a better option than allowing your dog to fill their diet deficiency through daily grass eating. Similar to the diet deficiency, your dog could be eating grass if they are not entirely satisfied with their current diet. [2. Grass eating patterns in the domestic dog] Evaluate their dog food and consider if you are feeding them a complete and balanced diet for their age and breed.
