The father reached over the seat again, and after saying something to his son in a soft voice that didn’t match his hard lie-scent, he grasped the fox by the scruff of the neck.
-- Narrator (Chapter 1 paragraph 10)

Importance: When Peter’s father attempts to comfort Peter as he is letting Pax go free, Pax recognizes that Peter’s father is lying.

Six months — maybe more — of living here with his grandfather, who always seemed on the verge of blowing up.
-- Narrator (Chapter 2 paragraph 23)

Importance: Peter seems most unhappy about living with his grandfather because of his grandfather’s temper and ability to be easily angered.

Pax had been born with that same instinct as well, but distrust is no match for kindness administered consistently and unmeasured, especially in creatures new to the world. Pax had been only sixteen days old when Peter had rescued him — a fatherless, motherless curl of charcoal fur, his eyes barely opened — and...
-- Narrator (Chapter 5 paragraph 6)