Dog Pregnancy Calculator
Estimate whelping date from the day of breeding (63-day gestation).
Gestation averages 63 days from ovulation. Progesterone testing gives the most accurate date.
- Day 21: Embryo implantationAugust 13, 2026
- Day 28: Vet palpation possibleAugust 20, 2026
- Day 30: Ultrasound confirms heartbeatAugust 22, 2026
- Day 45: X-ray reliable to count puppiesSeptember 6, 2026
- Day 56: Set up whelping boxSeptember 17, 2026
- Day 63: Expected delivery daySeptember 24, 2026
Everything you need to know about the Dog Pregnancy Calculator
Dog gestation is 63 days on average (range 58 to 68) from the day of ovulation. This calculator returns the expected whelping (birthing) date plus key milestones: implantation around day 21, palpation window at day 28 to 30, X-ray reliable after day 45, and nesting behavior in the final week.
Dog pregnancy is short and intense. From the moment of ovulation to the day the puppies arrive is on average sixty three days, with a normal window of fifty eight to sixty eight. This tool builds a full milestone timeline around your date so you can plan vet visits, ultrasound, X ray, and the whelping box without guesswork.
The three phases of canine pregnancy
The first three weeks are quiet on the outside. Fertilised eggs travel to the uterus and implant around day twenty one. During this window the mother behaves normally and needs no diet change.
From week four to week six the puppies grow rapidly, an ultrasound around day thirty confirms heartbeats, and appetite starts to climb. Food should be transitioned to a high quality puppy formula in small daily steps.
The final three weeks are the sprint. Abdominal size grows visibly, an X ray around day forty five reliably counts skeletons so you know how many puppies to expect, and by day fifty six the whelping box should be set up in a quiet, warm, low traffic space.
Nutrition through the pregnancy
By week six caloric needs climb by twenty five percent, and by week eight they can reach fifty percent over the maintenance baseline. Split the daily portion into three or four small meals because the growing uterus leaves less room in the stomach.
Use a puppy or all life stages food that meets AAFCO or FEDIAF growth standards. Avoid calcium supplements unless a vet prescribes them, extra calcium during pregnancy actually increases the risk of eclampsia later.
Getting ready for whelping day
Take the mother's rectal temperature twice a day from day fifty five. A drop below thirty seven degrees celsius usually signals labour within twenty four hours.
Have your vet's out of hours number, a clean whelping box, plenty of towels, unwaxed dental floss for umbilical cords, and a small scale ready. Weigh every puppy at birth and again every twelve hours for the first week.
- •Confirm ovulation with progesterone testing, it beats guessing from behaviour by days.
- •Book the ultrasound between day twenty eight and day thirty two.
- •Keep visitors away for the first two weeks after birth to protect immunity and bonding.
- •Feeding an adult maintenance food through pregnancy.
- •Skipping the X ray count, you will not know when the litter is complete during whelping.
- •Bathing the mother in the last week, stress and slippery surfaces are a poor combination.
How to use it
- 1Enter the date of confirmed breeding or ovulation.
- 2See the estimated whelping date and milestone timeline.
Frequently asked questions
How do I know breeding was successful?+
Ask your vet for a progesterone test around day 25 to 30, or an ultrasound.
What if my dog goes past 65 days?+
Contact your vet immediately. Beyond day 68 there is a risk of complications.