Is this correct in Denotation/Connotation Rewriting the sentence using a positive tone

Question

Original sentence: The dog stood at he door; his size was quite astounding the underline word is dog

Here is my new sentence: The big dog stood at the door; his size was quite astounding.

Answer 1

"Dog" is underlined? So you're supposed to replace that word with a synonym that gives "a positive tone"?

Please re-think.