Dog pregnancy is short compared with ours. Knowing roughly when the puppies are due gives you time to prepare a whelping area, plan vet visits and spot problems early.
How long are dogs pregnant?
According to VCA Animal Hospitals, pregnancy in dogs normally ranges from 57 to 65 days from mating, with an average of 63 days. If the dog was mated twice, birth can be expected 63 to 65 days after the matings.
The range exists because the date of mating is not always the date of ovulation, and sperm can survive in the reproductive tract for several days. Vets can narrow the window with hormone testing done around breeding.
Estimate the due date
Average due date = Mating date + 63 days
Example
a dog mated on 1 September 2026 has an average due date of 3 November 2026, with a normal window from 28 October to 5 November 2026.
Week-by-week overview
| Weeks (from mating) | What is happening / what to do |
|---|---|
| 1–2 | Fertilisation and early development. Few visible changes. Keep routine care and normal exercise. |
| 3–4 | Embryos implant. A vet may feel the pregnancy by palpation around 3 to 4 weeks. Some dogs have a brief drop in appetite. |
| 4–5 | Ultrasound can confirm pregnancy; scans after about day 28 are generally reliable. Discuss diet changes with your vet. |
| 6–7 | The belly and nipples enlarge. An X-ray around week 7 can help count puppies. Prepare a quiet whelping box. |
| 8–9 | Nesting behaviour may begin. Watch for signs of labour and keep your vet’s contact details handy. |
How pregnancy is confirmed
- Ultrasound: the method of choice according to VCA; can be positive from about three weeks, with scans after day 28 generally reliable.
- Palpation: gently feeling the abdomen at about three to four weeks; results vary.
- Relaxin blood test: detects a pregnancy hormone; testing too early can give a false negative.
- X-ray: best for counting puppies late in pregnancy, generally around week seven.
Preparing for whelping
- Set up a whelping box in a warm, quiet place a week or two before the due date.
- Ask your vet what to feed during late pregnancy and nursing.
- Many vets suggest checking her temperature in the final week, because a drop often comes shortly before labour. Ask your vet what reading to watch for.
- Have clean towels, a heat source for the puppies and your vet’s emergency number ready.
When to call the vet
Contact your vet straight away if she strains hard for a long time without producing a puppy, has a long gap between puppies, shows signs of distress or weakness, has a foul-smelling or unusual discharge, or goes well past the expected window. Your vet can give you specific time limits for your dog.
Curious how dogs compare with other animals? See our animal gestation periods chart. After the puppies arrive, when do dogs stop growing? explains what to expect as they grow.
Calculate the due date
Enter the mating date in the dog pregnancy calculator to see the due date and a week-by-week calendar. More animal tools are in biology calculators.
Important
Important: This article is general educational information, not medical or nutrition advice. Talk to a doctor or registered dietitian before changing your diet, especially if you are pregnant, under 18, or have a medical condition.
Frequently asked questions
Usually 57 to 65 days from mating, with an average of 63 days.
Ultrasound can detect pregnancy from about three weeks, and scans after day 28 are generally reliable.
Contact your vet if she goes beyond the expected window, as she may need to be examined.
An X-ray late in pregnancy, generally around week seven, is the best way to count puppies.
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