Thanks billt!
I am down to three completely black males now:

as far as their temperment goes....well, they are like little kids or babies right now.
when they want something they whine... and they have to try their teeth on everything.
whenever I would gingerly place the pyrex casserole dish into their whelping box to feed or water them, I would always whistle and say "HERE!"...."HERE!"...."HERE!"
so they learned already when they are out of the whelping box or in the backyard that when I whistle or say "HERE!", they come-a-charging
they are very alert and watch everything.