Which sentence uses the possessive apostrophe correctly when referring to one dog?

• A. The dogs bone is missing.
• B. The dog's bone is missing.
• C. The dogs' bone is missing.
• D. The dog bone's missing.

Answer: (B)

Form possession with an apostrophe-s after the owner when there is one owner. For one dog, that owner is dog, so you write dog’s.

The sentence The dog’s bone is missing expresses that the bone belonging to the dog is the one that's missing, and the verb is correct for a singular noun (bone). The other versions fail because they either omit the possessive mark, apply a plural possessive to multiple dogs, or misplace the possessive on the wrong word, which changes who owns the bone or makes the sentence sound awkward.