This is Banjo eating grass. He does this once a week or once every two weeks. He would not take his regular food, or would take it less. He will ask to go to the terrace and would eat the grass and Tulsi he can find in the pots.

Here is a video of Banjo hiding his treat,
http://www.haringo.com/2014/12/beagle-hiding-his-treat.html

Here are few pictures of Banjo,
http://www.haringo.com/2014/10/banjo-beagle-photos.html