It sounds as if he wants to hang out outside and not be indoors. A few of mine are like that. Would rather be out playing or laying in the sun.
Dogs eating grass isn't the worst thing. I asked our vet once when I had Pepper, since Pepper acted like she was a COW or something, and ate grass all the time. The vet said some dogs just like the taste of it!!
The only true wisdom is in knowing you know nothing.