How to use the dog pregnancy calculator
- Enter the date she was mated. If she was mated more than once, use the first date.
- Read the due date (day 63), the normal window and how far along she is today.
- Use the timeline below the result to plan vet visits.
The formula
Due date = mating date + 63 days. The normal window is day 57 to day 65 (VCA Animal Hospitals). The Merck Veterinary Manual puts the average at about 62 to 64 days.
Why the spread? Sperm can survive in the female for several days, and eggs need time to mature after ovulation, so the mating date is not the same as the day the pregnancy started. A vet can time ovulation with progesterone blood tests, which gives a narrower window.
Pregnancy checks (Merck Veterinary Manual, pet owner version):
- About day 21: a vet may feel the pregnancy by gentle palpation
- Days 25–35: ultrasound reliably confirms pregnancy and shows heartbeats
- Days 30–35: relaxin blood test
- After about day 45: skeletons show on X-ray
- After day 55: X-ray is the best way to count the puppies
Tips
- Count the puppies. VCA advises an X-ray late in pregnancy so you know when she has finished giving birth.
- Feeding changes in the last weeks of pregnancy and while nursing: ask your vet, as her needs rise a lot.
- Plan for the puppies. Their first vaccines start at about 6–8 weeks; see the puppy vaccination schedule. Not pregnant? The heat cycle calculator predicts her next heat.
- Call your vet if she strains hard for a long time without a puppy, seems very unwell, or goes past the window.
Sources
- VCA Animal Hospitals: Breeding for Pet Owners, Pregnancy in Dogs.
- Merck Veterinary Manual (pet owner version): Management of Reproduction in Dogs.
Frequently asked questions
How long is a dog pregnant?
About 63 days, or nine weeks, from mating. VCA Animal Hospitals gives a normal range of 57 to 65 days, and the Merck Veterinary Manual says about 62 to 64 days. Timing from ovulation, which a vet can measure with progesterone tests, is more exact than timing from mating.
How long is a dog pregnant in weeks?
About 9 weeks. The normal range of 57 to 65 days is just over 8 to just over 9 weeks.
How many days does dog pregnancy last?
63 days on average from mating, with most dogs giving birth between day 57 and day 65. If she was mated more than once, VCA suggests expecting birth 63 to 65 days after the matings, so count from the first date and keep the window in mind.
How can I tell how far along my dog is?
Count the days from the mating date; the calculator shows the day and week. A vet can tell more: ultrasound reliably confirms pregnancy from about day 25–35, and an X-ray after about day 45 shows the skeletons and helps estimate how far along she is.
When can a vet confirm dog pregnancy?
From about 3 weeks. The Merck Veterinary Manual says a vet may feel the pregnancy at about day 21, ultrasound can reliably detect it by day 25 to 35, and a relaxin blood test can detect it by day 30 to 35.