A dog's pregnancy lasts about 63 days from ovulation. Timed with progesterone or LH testing, whelping comes 64–66 days after the LH surge. Counted from the first breeding, it can be anywhere from 58 to 72 days.
This guide splits those nine weeks into three stages of about three weeks each: what is happening, what she looks like, and what to do. Day numbers count from ovulation, so from a breeding date alone your count can be several days off either way. For a finer view, see the week-by-week pregnancy guide.
from ovulation to whelping (average)
64–66 days from the LH surge · 58–72 days from the first breeding
The short version
- About 63 days: from ovulation; 64–66 days after the LH surge; 58–72 days from the first breeding.
- Same calories for six weeks: then increase gradually: at least 20–30% more, up to 30–60% for a big litter. Puppy food, not a large-breed formula, and no calcium. Started underweight? Ask your vet.
- Ultrasound about day 28, X-ray after day 55: the first confirms the pregnancy; the second counts the puppies, so you know when she has finished.
- Call your vet: for green, black, bloody or foul discharge, signs of labor well before her due window, no labor once it has passed, or panting and trembling.
The three stages at a glance
| Stage | What's happening | What you can check |
|---|---|---|
| Days 1–21 | Fertilization, then implantation at about day 18–23. No outward signs. | Nothing reliable yet. An ultrasound before about day 21 can miss it. |
| Days 21–42 | The puppies take shape: eyelids by day 32, toes by day 35. Her teats may “pink up”. | Ultrasound (best at days 25–35); relaxin blood test (after about day 22–27). |
| Days 42–63 | Most of the puppies' growth. Her belly is enlarged and firm by about day 45–50. | X-ray: skeletons show from about day 42–45; count them after day 55. |
Merck Veterinary Manual; VCA Animal Hospitals; AKC.
Days 1–21: no visible signs, no extra calories
What is happening
Her eggs need 2–3 days after ovulation to mature before they can be fertilized. Sperm can wait for them: they can live in her reproductive tract for a week or more.
The embryos implant in the uterus at about day 18, and small swellings form along it by about day 21. AKC gives 18 to 23 days for implantation.
What she looks like
Usually no different. Many dogs show no signs at all in the first three weeks.
What to do
- Keep her calories the same. Her needs don't rise yet, and Merck calls overfeeding in early pregnancy a common mistake. Moving her onto a puppy (growth) food now is fine, and Merck recommends it from the start of pregnancy. A puppy food packs more calories into each cup, so work out her portion from the calories on the bag rather than keeping the same scoop.
- If she started the pregnancy underweight, ask your vet how much to feed. Merck's same-as-usual advice assumes she didn't.
- Check every medication with your vet first, including flea and tick products, vaccines and supplements. VCA warns that some commonly used medications should be avoided in pregnancy.
- Keep her exercise normal. VCA says to let her decide how much activity she wants and not to over-exercise her.
- Write down the breeding dates, and the LH surge or ovulation date if your vet timed it. Every date later in the pregnancy counts from these.
Days 21–42: confirm the pregnancy — her food stays the same
What is happening
The puppies take shape. AKC's timeline has the fetus forming by day 22, eyelids by day 32 and toes by day 35.
Their skeletons start to calcify from about day 28, but won't show on an X-ray yet. The swellings in the uterus double in diameter every week, then get harder to feel after about day 35–38.
Confirming the pregnancy
Your vet has three ways to confirm it.
| Test | When | What it tells you |
|---|---|---|
| Ultrasound | Best at days 25–35; most scans after day 28 are reliable | Confirms the pregnancy and that the puppies are alive. Can't count them accurately. |
| Relaxin blood test | After about day 22–27 | Yes or no. Can miss a litter of one or two puppies, and a positive doesn't mean the pregnancy will succeed. |
| Feeling the belly (palpation) | About day 21 to day 35 | Your vet may feel the swellings. Results vary, and they get harder to feel after day 35–38. |
Merck Veterinary Manual (Pregnancy Determination in Bitches and Queens); VCA Animal Hospitals (Pregnancy in Dogs).
What she looks like
- “Pinking up”: her teats enlarge and turn pinker, often in the first month.
- A few days of “morning sickness” after implantation in some dams: off her food, or vomiting. If the vomiting keeps going or she loses weight, call your vet.
- A bigger appetite and some weight gain as the second month goes on.
- A little clear, odorless discharge can be normal in the second month. Bloody, foul-smelling, green or black discharge is not: call your vet.
What to do
- Book an ultrasound for about day 28. It confirms the pregnancy and shows the puppies are alive.
- Keep her calories at her normal level. Merck and VCA both keep her at her usual intake for the first two-thirds of pregnancy, about six weeks, as long as she started at a healthy weight.
- Start whelping preparations: order supplies, set up the whelping box, and find your 24-hour emergency vet.
- Book the X-ray for after day 55 so it's on the calendar.
Days 42–63: the puppies grow, she eats more, and you count them
Most of the puppies' growth happens now. Merck notes very little growth happens in the first two-thirds of pregnancy. AKC's timeline has nails by day 40, coat and skeleton by about day 45, and development almost complete around day 58.
The X-ray after day 55
The skeletons first show on X-ray at about day 42–45 and are clear by day 47–48. Merck notes radiography at this stage is not teratogenic, and an X-ray after day 55 is the best way to count the litter.
Your vet may also look at the puppies' size and position. Merck notes fetal size varies with breed and litter size, so treat it as one input to your vet's plan, not a prediction of how delivery will go.
What she looks like
- An enlarged, firm belly by about day 45–50, and puppy movement you can see by about day 50. A small litter shows later and less.
- Fuller mammary glands as whelping nears. Merck notes this sign is not a reliable timer.
- Eating less per meal: AKC lists a drop in appetite around day 45, and appetite loss again around day 61–62, close to labor.
- Nesting from about day 58–62, with restlessness, digging and panting as labor nears. Her waist may trim in the last days as the puppies move into the birth canal.
- A temperature drop 8–24 hours before whelping, to an average of 98.8°F (range 98.1–100°F) in Merck's figures. That is why you learn her normal readings first.
What to do
- Increase her food gradually from about day 42: at least 20–30% more than her normal amount (Merck), up to 30–60% more for a big litter (VCA). Feed smaller, more frequent meals as the puppies crowd her stomach.
- Feed a puppy (growth) food, not a large-breed puppy formula. VCA recommends a puppy food in the third trimester and warns that large-breed puppy formulas have the wrong calcium and phosphorus balance. Merck recommends a growth diet from the start of pregnancy.
- No calcium supplements unless your vet prescribes them (see the FAQ below).
- Get the X-ray after day 55.
- Take her rectal temperature twice a day from about day 56, morning and evening, so you know her normal readings and can see the drop.
- Finish whelping preparations: supplies organized, box set up, emergency vet number posted, a helper arranged. See our whelping box setup guide.
- Know the signs of labor and the line between normal whelping and an emergency before labor starts.
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A thermometer for the last week
The twice-daily readings from about day 56 are how you see the drop before labor.
iProven dog & cat thermometer, flexible tip, 20-second read (DTK-117Y)
Flexible tip · 20-second readA dog thermometer with a flexible tip that reads in about 20 seconds, which matters when she won't hold still. Label it as hers and use it for the twice-daily readings from about day 56.
How much to feed at each stage
Merck names overfeeding in early pregnancy as a common mistake. Her needs only rise in the last third.
| Stage | How much | How to feed |
|---|---|---|
| Days 1–21 | Her normal calories | A complete and balanced puppy (growth) food is fine from now on (Merck). Work out the portion from the bag's calories. |
| Days 21–42 | Still her normal calories | Keep an eye on her weight and body condition. Started underweight? Ask your vet. |
| Days 42–63 | Up gradually: at least 20–30% more (Merck), up to 30–60% for a big litter (VCA) | Smaller, more frequent meals. Puppy food, not a large-breed formula. No calcium supplements. |
Merck Veterinary Manual (Feeding Practices in Small Animals); VCA Animal Hospitals (Feeding the Pregnant Dog; Pregnancy in Dogs).
After whelping her needs keep climbing, to two to four times her usual food at peak milk. See our guide on feeding the nursing dam.
Warning signs at each stage
Most pregnancies go smoothly. These are the signs that need your vet.
Days 1–21
- A pregnancy can end without any sign you'd see. Some infections can do this, which is one reason health testing before breeding matters.
- Medicines and chemicals in early pregnancy can harm the puppies. Check every one with your vet first.
Days 21–42
- Bloody, foul-smelling, green or black vaginal discharge: call your vet.
- Vomiting that keeps going, or weight loss: a few days of morning sickness can be normal, but this is not.
Days 42–63
- Signs of labor well before her due window: call your vet now. Puppies born too early may not have mature lungs.
- No labor by the end of her due window: see the box above.
- Green or black discharge before the first puppy: call your vet now. Merck counts green discharge as abnormal.
- Panting, restlessness, trembling, or a stiff or wobbly walk: these can be eclampsia, a dangerous drop in blood calcium. It is rare before whelping and mostly strikes at peak milk, 1–4 weeks after. It is an emergency: call your vet now.
For the day-by-day breakdown, see our dog pregnancy week-by-week guide. For how gestation length is counted and why it varies, see our gestation length article.
BreedTools App · pregnancy
Every stage has its day.
Get reminded before it comes.
Ultrasound, whelping box, temperature checks: each one matters on a particular day of her pregnancy. The app keeps her pregnancy calendar and tells you what is coming up.
Reminders before each milestone
The ultrasound window, whelping-box setup and twice-daily temperature checks show up on your dashboard days ahead.
A pregnancy checklist that knows the day
Each item is flagged as due when she reaches its day.
Whelping temperature watch
Log her readings morning and evening and see the pre-labor drop on a chart.
Works in the whelping room
Log a reading with no signal; it syncs when you're back online.
Canine pregnancy stages FAQs
1How long are dogs pregnant?
About 63 days from ovulation. If your vet timed the breeding with progesterone or LH testing, whelping is due 64 to 66 days after the LH surge (the first rise in progesterone), which is as precise as a due date gets. Counted from the first breeding the range is much wider, 58 to 72 days, because sperm can live in her reproductive tract for a week or more and her eggs need 2 to 3 days after ovulation to mature before they can be fertilized.
2When can you confirm a dog is pregnant?
Ultrasound is the method of choice: Merck says it is best done at 25 to 35 days, and VCA says most scans after day 28 are reliable. Before about day 21 it can miss a pregnancy. A relaxin blood test at your vet works after about 22 to 27 days, but it can miss a litter of one or two puppies. A vet can sometimes feel the swellings in the uterus from about day 21 to day 35, but results vary. None of these counts the puppies accurately: for the count, use an X-ray after day 55.
3When should I increase my pregnant dog's food?
Not for the first two-thirds of pregnancy, about the first six weeks. Merck and VCA both say her calorie needs stay at her normal level until then, as long as she started the pregnancy at a healthy weight (if she was underweight, ask your vet), and Merck calls overfeeding in early pregnancy a common mistake. If you switch her to a puppy food, which has more calories per cup, work out her portion from the calories on the bag rather than keeping the same scoop. From about day 42, increase gradually: at least 20 to 30% more than her normal amount (Merck), or up to 30 to 60% more for a big litter (VCA). Split it into smaller, more frequent meals as the puppies crowd her stomach. Feed a complete and balanced puppy (growth) food, but not a large-breed puppy formula.
4Can you X-ray a pregnant dog?
Yes, and VCA says it should be done for every pregnant dog, because the puppy count is how you know when she has finished delivering. Merck says an X-ray after day 55 is the best way to count the litter. The puppies' skeletons first show on X-ray at about day 42 to 45, and Merck notes that radiography at that stage is not teratogenic (it does not cause birth defects).
5What are signs of pregnancy problems?
Call your vet if she has vaginal discharge that is bloody, foul-smelling, green or black (a little clear, odorless discharge in the second month can be normal); vomiting that keeps going; she refuses food for more than a day, or goes off her food with vomiting, weakness or dullness; a fever; signs of labor well before her due window; or no labor once 64 to 66 days after her LH surge have passed (day 66 from the first breeding if you only have breeding dates). Panting, restlessness, trembling or a stiff walk can be eclampsia, which is rare before whelping but an emergency: call your vet now.
6Should I supplement calcium during pregnancy?
No, not unless your vet prescribes it. Merck says calcium supplements in pregnancy may cause the eclampsia they are meant to prevent: extra calcium turns down the system that controls her blood calcium, so when milk production peaks after whelping it can't respond fast enough. A complete and balanced puppy food already has the calcium she needs. The exception is a dam who has had eclampsia before: her vet may give calcium during peak lactation.
Related Tools
Sources: Merck Veterinary Manual — Breeding Management of Bitches; Whelping and Queening in Bitches and Queens; Pregnancy Determination in Bitches and Queens; Feeding Practices in Small Animals; Disorders of Calcium Metabolism in Dogs. VCA Animal Hospitals — Pregnancy in Dogs; Feeding the Pregnant Dog; Eclampsia in Dogs. American Kennel Club — How Long Are Dogs Pregnant? Dog Gestation Period. Concannon PW, Whaley S, Lein D, Wissler R. Canine gestation length: variation related to time of mating and fertile life of sperm. Am J Vet Res 1983;44(10):1819–1821. This article is for educational purposes and does not replace professional veterinary care.