Dogs eating grass is actually quite common (it has been observed in wild dogs, too, and may be completely natural) and this form of pica does not usually cause too many problems. In fact, most veterinarians consider it a normal dog behavior.
What does it mean when dogs start eating grass and does this have any effect on the dogs health?An important nutrient that dogs need, among vitamins and minerals, is fiber. Fiber helps improve digestion and control the transit of food through the GI tract.
But are grass-fed beef and vegetarian eggs the right choice?Make sure that the menu choices being highlighted by different distributors are the things you want animals to be eating that is to say, the foods that their bodies evolved to eat.

Such details provide a deeper understanding and appreciation for What Foods To Feed Dogs That Eat Grass.
Serious Eats Roadfood Roundup: Hot Dogs.
Can dogs eat tomatoes? Learn when its safe to feed your pup tomatoes, the risks to avoid, and how to serve them.

I have heard that dogs eat grass to vomit out what they have in their stomach.A few say they're good for their digestive system and a few say they are deadly. Though I understand dogs dont need grass as a food supply but still because of this behavior, I am a bit confused. Worried also.
A new analysis of the feed/food debate ScienceDirect.