The sentences that should be included in a summary of the paragraph are:
- Pugs were once the companions of emperors.
- The pug's motto is "a lot in a little."
- Pugs are loved by many people around the world.
- Pugs have a round head, sparkling eyes, and a wrinkled brow.
(Note: The sentence "Pugs are a lot of dog in a little body" has a similar meaning to "The pug's motto is 'a lot in a little,'" but it is not a direct quote and may not be necessary to include if the quote is present. However, it can still be considered relevant to the summary as a supporting statement of the dog’s essence.)