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 It is used with nouns referring to people, groups of people, countries, and animals. 'Belonging to' or 'ownership' is one of the relationships it expresses : 
 
 Form  For names ending in -s: Examples: The car of John = John's 
            car. 
 The possessive is also used to refer to shops, restaurants, churches 
            and colleges, using the name or job title of the owner. Examples: 
 
 I've got an appointment at the dentist's at eleven o'clock. | 
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 1. Peter's boat is really beautiful. 2. I like dog's John. It is so cute! 3. I had a walk with Thomas's girlfriend. 4. Women's jobs are very hard! 5. I went to the dentist. 
 ANSWERS 1. Peter's boat is really beautiful. OK | 2. I like dog's John. It is so cute! WRONG> John's dog | 3. I had a walk with Thomas's girlfriend. OK | 4. Women's jobs are very hard! OK | 5. I went to the dentist. WRONG> to the dentist's. |