also remember that the due date is not a singular day . A female may be bred over a 5 day period -- had one happy female that would stand almost the entire 21 days of the cycle - you witness a tie , you figure out when those pups are due. Anyway even at best the gestation time is 60 to 63 days , then figure out if conception was on day one or the last time you had a tie , and then the semen has a survivability of 48 hrs(?) so conception again is not the date of the tie .
You may have in some cases a litter that may be born a week later than expected by calendar estimation.
O C'mon Carmen, everyone knows that breeders should take their bitches in multiple times and have their blood tested mutliple times to pinpoint the exact day of ovulation. Then that can add 63 days to that, and they can then schedule the day off, and tell all their prospective puppy buyers when the pups are due.
At about 4 weeks they just must do an ultrasound to ensure that conception has taken place and there are puppies. It won't tell you the number or sex though, but you might as well contact puppy buyers with that information at well. If the bitch contracts something while at the vet and loses the litter, well tough luck, it is just so much more important that we have that information for the puppy buyers that are going to split or get a puppy elsewhere before these guys are ready to go anyway.
Because we don't know how many yet, we should go ahead and take her back to the vet at about 8 weeks along to get a count. Puppy buyers will want to know this too, even though, again they will not know if they are males or females either, and they will not even know if the count is accurate, but, what the hey, get her x-rayed and expose her to the vet again, and x-rays again.
And, just because your bitch was
pregnant, doesn't mean she stayed pregnant. Bitches can resorb puppies for a number of weeks.
It is nature. It happens. I generally wait a week before contacting, though I have only lost pups once after the first day. That first week though is always kind of nerve-racking.