With number five, I think the reason why you catch your cat eating grass is because it is trying to find a first-aid cure for its upset stomach—to name one. My dogs also do the same. As well as the stray cat my dogs “befriended.” Later on, you might see your pet vomiting the chewed grass along with the stuff it ate that made it feel sick. But of course, this is just my opinion based on observation. I'm not an expert, just an animal lover. ^_^ thanks!