In the second sentence, the reference to the dog requires the change of the article from "a" to "the."
The main difference between the two articles is that "the" is definite, while "a" is indefinite.
Article "a" is indefinite because it can represent any object.
Article "the" is a definite article because it represents a specific object.
Thus, the second sentence should be re-written as "I think the dog belongs to Mr. Smith."
Learn more about definite and indefinite articles at https://brainly.com/question/24153047
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