Achtung Wolf!

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Wolves is picture book written and illustrated by Emily Gravett, published by Macmillan in 2005. Her first book, it won the annual Kate Greenaway Medal from the professional librarians as the year's best-illustrated children's book published in the U.K. It was also bronze runner up for the Nestlé Smarties Book Prize in ages category 0–5 years.
Wolves features a rabbit who checks out a library book about wolves "approved by the National Carroticulum", and attentitively reads that book-within-a-book. In the U.S. it was published by Simon & Schuster in 2006 as "Wolves by Emily Grrrabbit".