You won't know if she has "gone over" so to speak if you are using breeding dates. 63 days goes from the date of ovulation, not date of breeding. If you don't do progesterone or LH testing or have a history of prior ovulation dates for a particular bitch (or have a dog that will only breed a bitch when she is indeed fertile, which is somewhat unusual) you don't actually know the due date. Sperm can live 5-7 days and possibly longer, so it is possible that she was bred 5 days prior to ovulation, with the eggs being fertilized 2 days post- ovulation. So if you are working off a breeding date you might think the bitch is overdue by 5 days when in reality she is right on time at day 68 per your count... |