Which preposition to use with puppyhood

of Occurrences 1%

From five to eight weeks is always a critical period in the puppyhood of a Griffon, and it is necessary to supersede their maternal nourishment with extreme caution.

with Occurrences 1%

I myself like dogssleepy dogs blinking in the firelight, friendly dogs with wagging tails, young dogs in their first puppyhood with their teeth scarce sprouted, whose jaws have not yet burgeoned into danger, and old dogs, too, who sun themselves and give forth hollow, toothless, reassuring sounds.

Which preposition to use with  puppyhood