My friends bitch is on day 60 from the second mating today, and her milks come in, searched the book of the bitch and found nothing on this just woundered if this was a sign that she is about to give birth or do some bitches start to produce milk days before whelping?

I've had bitches produce milk a week before whelping, whereas others not until the day after whelping, so I guess as she's close any way it's just a case of watch and wait.