He ate in a ravenous way that was very disagreeable, and all his actions were uncouth, noisy, and greedy. Some of his teeth had failed him since I saw him eat on the marshes, and as he turned his food in his mouth, and turned his head sideways to bring his strongest fangs to bear upon it, he looked terribly like a hungry old dog.
– Charles Dickens
Great Expectations, Chapter 40. Pip gives Magwitch food and observes the way he eats. He is repulsed by the way Magwitch devours his food and loses his own appetite as a result. In a simile Pip compares Magwitch to a “hungry old dog.”