This is Mr. Whipple.
One time I thought he ate a metal wire, so off to the vet we went. Turns out the cat was vomiting alot because he was impacted (i.e. constipated). The vet told me to get him more fiber and moisture in his diet, either through feeding him greens, canned pumpkin, or wet cat food. (Yes, believe if or not, cats LOVE canned pumpkin, and it smells much nicer than wet food)! But this post is about grass. Pumpkin puree will have to wait for next fall.