I didn't think this was why I WSed grasses!
But Mr. Muscle Cat has corrected me!
I gathered a bunch of containers in a pan so I could take it out back to plant out. There was Melica Altissima (I probably slaughtered that name) and Vanilla Grass. Mr. Muscle Cat went straight for the Vanilla Grass and started chowing down! Maybe that means he won't poop in the garden wherever I have it planted...lol.
And here he is, guarding the new home of the Vanilla Grass: