Nate, who is about 3 years old, calls his family pet, Molly, a dog. (Molly is in fact a dog.) However, all other dogs he calls "kitties."This is an example of

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Nate correctly identifies his family pet, Molly, as a dog, which is an example of underextension, as he is applying the term "dog" too narrowly, only to his family pet. However, calling all other dogs "kitties" is an example of overextension, where he is applying the term for one animal to all similar animals. Thus, his behavior is an example of both an overextension and an underextension.

Nate, Who Is About 3 Years Old, Calls His Family