The name Petrarchan Sonnet comes from the fact that it was a man named Petrarchan who created this structure. The Petrarchan sonnet is divided in two parts: one is called the "octave" (of 8 lines) and the other "sestet" (of 6 lines), for a total of 14 lines. It is in the octave that a problem or theme is typically introduced.
The first sentence about Siamese cats is correct because the hypens are correctly placed where you pause when reading. The other answers have misplaced the hypens and they aren't in the appropriate place for pausing.
