There are a variety of reasons why your dog might be grazing on your lawn. Some people propose that dogs might turn to eating grass when they don't feel well as a way to make themselves vomit, and then feel better. Others dispute this idea, on the basis that dogs are not provwn to be smart enough to decide to treat an upset stomach by eating grass.
Evidence suggests that most dogs that eat grass aren't unwell beforehand, or at least they don't seem to be. In fact, fewer than 10% of dogs seem to be sick before eating grass.
Other suggested reasons why your dog might be eating grass include improving digestion, treating intestinal worms, or fulfilling some unmet nutritional need.
Source: {http://www.pets.webmd.com/dogs/why-do-dogs-eat-grass}
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