The problem resolved after the dog was placed on a commercial high-fiber diet. This was evidence that this dog was supplementing his dietary deficiency by eating grass and plants. Once provided with adequate fiber in his diet, the grass-eating behavior resolved.
Dogs sometimes eat grass to soothe an upset stomach, and this is one of the most common explanations. When their bellies feel off, some dogs instinctively munch on grass to induce vomiting or to help move things along in their digestive tract.
How do dogs know to eat grass when their stomach hurts? The other type of grass eating is thought to be more of an instinctive behavior. This is thought to be a deliberate attempt to induce vomiting after theyve swallowed something that makes them feel ill.

The Basics: Why Do Dogs Eat Grass?. Before we focus on poodles, lets understand why dogs, in general, munch on grass: Natural instinct: Dogs are descendants of wild canines who often consumed plant material. Dietary supplement: Grass might provide f...
Youre bloated. Find out why it happens from WebMD and what you can do about it.It can take 20 minutes for your stomach to tell your brain youre full, so you can eat enough to make yourself bloated and uncomfortable before your brain gets the message.

evolved after dogs began to be domesticated.