Llewelyn setter and part greyhound. Have students look up pictures of both kinds of dogs and then draw a picture of what Fortinbras might look like if he got parts of each type of dog. Let students compare their pictures to discover the variations possible. This can tie into a lesson on genetics. You might want to introduce a discussion of Einstein and of Thomas Edison, both of whom were geniuses who, as children, were thought to have low intelligence.
Most people think that being gifted is entirely good.
Using what the children learn from this book, have them discuss the benefits and challenges of being gifted. If your students are gifted, have them discuss how they are perceived and what they do about it. It could be interesting, if your students are not in a gifted class, to have them meet with a class that is and compare notes. This should be carefully monitored and is better with older students. Acceptance by others is considered by many people to be an important part of life.