Translation:It is a dog.
'I am a dog'? You can't have that as the answer. You can only drop the pronoun/subject/topic of a sentence if it has already been mentioned or is implicitly understood what is being talked about. One can not just guess that the subject is 'I' in this case when all other examples of 'nounです' has been 'It is a noun.' My answer of 'a dog' should be correct but it wasn't...