Eat your greens

Maisie eats quite a lot of grass. It can be annoying waiting when we are on a walk and I worry sometimes that we don't know if any has been sprayed ,as it tends to be on the roadside or under peoples' fences. 
I found this pot in the garden centre and she loves it. It remains a mystery to me, but apparently tastes very appealing. Mr Google tells me grass eating is common, with an average of 3 mins per day per dog. Who worked that out I wonder? Anything for my girl I say...