Dog Pregnancy Calculator & Due Date
Enter the breeding date to estimate when your dog is due to whelp, plus the likely window and how far along she is today.
Dogs carry about 63 days from ovulation; timing from a single breeding can shift by several days. Confirm with your vet — an ultrasound (~day 25) or x-ray (after day 45) gives a count and a firmer date.
Estimate only — not veterinary advice. Every animal is different; for a medication dose, a possible poisoning, or any emergency, call your veterinarian or an animal poison control line right away.
Reading the due-date window
Because conception timing isn't exact from a single breeding, the most useful output is the window: the earliest and latest likely whelping dates around the 63-day estimate. Mark all three on a calendar and plan to have a whelping box ready a week or two early.
What to do as the date nears
In the final week, set up a quiet whelping area, gather supplies, and start taking your dog's temperature twice a day — a drop below ~99°F signals labor is likely within a day. Keep your vet's number and an after-hours emergency number handy in case of complications.
Frequently asked questions
- How long are dogs pregnant?
- About 63 days from ovulation. Measured from a single breeding date it can range from roughly 58 to 68 days, because sperm can survive several days and the egg has to mature. That's why the calculator shows a window, not just one date.
- How can I confirm the pregnancy and date?
- Your vet can confirm with an ultrasound around day 25–35 (which also checks viability) and an x-ray after about day 45, which can count the puppies. Those give a far firmer timeline than a breeding date alone.
- What are the signs whelping is close?
- In the last day or two many dogs go off their food, become restless and start nesting, and their body temperature drops below about 99°F (37.2°C). A temperature drop usually means labor within 24 hours.
- How should I feed a pregnant dog?
- Calorie needs rise sharply in the last third of pregnancy and during nursing — often switching to a puppy/growth food. Ask your vet for a plan; the dog calorie calculator can help you track the increase.
Sources
These are the references behind this calculator. Where a source gives a range we take the midpoint and round toward caution, and where we go beyond what a source states — an extra safety margin, or a rule of thumb rather than a clinical threshold — the page says so in the text above.
- Estrus and mating in dogs — VCA Animal Hospitals