Final answer:
O fragment. The group of words 'The dog's ear' is a fragment because it lacks a verb and does not form a complete sentence.
Step-by-step explanation:
The group of words 'The dog's ear' is a fragment.
A sentence fragment is a group of words that lacks a subject, a verb, or both, or is a subordinate clause punctuated as though it were a sentence by itself. In this case, 'The dog's ear' lacks a verb and does not form a complete sentence.
To fix this fragment, you can add a verb to make it a complete sentence. For example, 'The dog's ear is floppy.' Now it has a subject ('The dog's ear') and a verb ('is').