Dog Pregnancy Calculator

How It Works

Canine pregnancy lasts approximately 63 days from ovulation, though it can appear to be 58-68 days from mating since sperm can survive several days and the exact ovulation timing varies. Key milestones: embryo implantation occurs around day 19, heartbeats are detectable by ultrasound around day 25, and puppy skeletons become visible on x-ray around day 45 (which is the best way to count how many puppies to expect). In the last week, the mother will begin "nesting" behavior. A rectal temperature drop below 99 degrees F typically signals labor will begin within 24 hours. First-time mothers may have slightly longer or more difficult labor. Always have your veterinarian's emergency number ready.