Which sentence uses the apostrophe correctly? 

1. The dogs’ bowl is empty
2. The dog’s bowl is empty
3. The dogs bowl is empty
4. The dogs’s bowl is empty

The singular possessive form requires ‘s for one dog. Dogs’ (option a) would be correct for multiple dogs sharing a bowl. Option d incorrectly doubles the possessive marker. AP Stylebook Rule: Use ‘s for singular nouns (even ending in s) and s’ for plural possessives. Exception: Classical names (e.g., Jesus’ teachings).