Originally Posted by
Shelley
This is 100% completely false.
Eggs are ovulated, and take 24-48 hours to "mature" to be able to be fertilized by the semen, after that they float around until about day 16 to 20, when they implant into the wall of the uterus and grow. The cells divide to a certain point then stop, before implantation, so all puppies are the exact same 'gestational' age at whelping. We time whelping due dates from when the progesterone level gets to a certain number, and count from there, not ever dates of breeding. :-)