The Puppy Whelping Calculator
Use this version of the script if your pups have not arrived yet, and you know the date breeding took place. This script will calculate their birth date using the standard 63 day gestation period.

 

Date of First Breeding:        (MM/DD/YYYY Format)   Estimated Due Date:

Puppies are usually born 61 days after conception. It takes 48 hours for the egg to ripen before the Egg will allow penetration of Sperm. If your female ovulates on day 11 of her cycle, then conception begins on day 13 of her cycle. Not knowing exactly when ovulation occurs, this is about as close as you can get to predicting her due date.