Change of diet

Harry the Heron is sick to the beak of fish. He's had enough. Finito. 
He'd love to switch to a dog diet but the owners of the more manageable little yappy sausage dogs seem determined to thwart his nefarious attempts at diversifying his diet. They keep them on the leash and close by. 
His day will come, you watch this space. 
In the meantime he may have to settle for the tantalising poo bag that this dog owner is casually dangling by his side.