Don't Hurtle a Turtle. Margaret Mason wrote this poem over 20 years ago. The poem is a masterpiece of visual brilliance captured perfectly by the cartooning skill of Simon Creedy. Together they turn a great poem into a vision of excellence. Cody, the cartoon dog, is an amazingly clever, kind, intuitive and positive dog who brings joy to all around him. His love, gentleness and vulnerability is simply captivating.