Question

highlight all the words that make up the appositive phrase. my hungry dog skippy ate a biscuit out of frank sinatras hand.

Explanation:

An appositive phrase renames or identifies a noun. In the sentence "My hungry dog Skippy ate a biscuit out of Frank Sinatra's hand", "Skippy" renames the noun "dog", so it is the appositive phrase.

Answer:

Skippy