In each question, the first and the last sentences of the passage are numbered S1 and S6 respectively. The rest of the passage is split into four parts. These four sentences are jumbled. Read the sentences and identify their correct and logical order.

---

S1: The domestic cat is a contradiction in itself.
P: But the adult pet dog also sees its human family as the dominant members of the pack.
Q: Nursed in kittenhood it develops extraordinary intimacy with mankind.
R: The dog, like the pet cat, sees its owners as pseudo-parents.
S: At the same time, however, the cat continues to retain its independence.
S6: Hence it has won such a reputation for obedience and loyalty.
The Proper sequence should be: