Dog Pregnancy Week by Week: The Complete Timeline

Canine gestation runs about 63 days from ovulation — roughly nine weeks. That's short enough that a week of drift matters, and long enough that a lot has to happen on schedule. This is what each week looks like, and what you should be doing during it.

For your own dates rather than generic weeks, run your breeding or ovulation date through our free dog pregnancy calculator — it produces the due date plus every milestone below as calendar dates.

First, Count From the Right Day

Every week below is measured from ovulation, not from the breeding. This distinction is the single most common source of confusion, and it's not pedantry: canine sperm survives up to five to seven days in the reproductive tract, so a bitch bred on the 1st may not conceive until the 6th.

Count from the breeding and your timeline runs up to a week early. That's how breeders end up thinking a litter is "overdue" when it's precisely on time — and, worse, how they end up not yet set up for whelping when labor starts. Progesterone testing pins ovulation to within about a day, which is exactly why it's standard practice. Our guide on when to breed a dog covers that testing in detail.

Week 1 (Days 0–7): Fertilization

Ovulation occurs, and the eggs need roughly two days to mature before they can be fertilized. Fertilization happens in the oviducts, and the resulting zygotes begin dividing as they travel toward the uterus.

Outwardly: nothing. She looks and behaves exactly as she did. There is no test, no sign, and no way to know.

What to do: record the date. That's genuinely the whole job this week, and it's the date every subsequent decision depends on.

Week 2 (Days 8–14): Implantation

The embryos reach the uterus and implant in the uterine wall around day 14. Development begins in earnest.

Outwardly: still nothing. Any "signs" noticed this early are wishful thinking — and a phantom pregnancy can produce genuinely convincing ones, since a non-pregnant bitch's hormones after a heat look nearly identical to a pregnant one's.

What to do: maintain normal feeding and normal exercise. Resist the urge to change anything; extra food this early goes to fat, not puppies.

Week 3 (Days 15–21): First Confirmation Possible

Embryos are developing rapidly. Some bitches show a subtle appetite change or slight behavioral shift, though many show nothing at all.

A relaxin blood test may confirm pregnancy from around day 21. Relaxin is produced by developing placental tissue, so unlike hormone-based reasoning it won't return a false positive on a phantom pregnancy — a genuinely useful property. Ask your vet about timing; too early gives false negatives.

Week 4 (Days 22–28): Ultrasound Window

This is when pregnancy becomes real information rather than hope. Ultrasound from around day 25 to 30 can confirm pregnancy and show fetal heartbeats. It won't reliably count puppies — overlapping fetuses make that unreliable — but a heartbeat is confirmation nothing else matches this early.

Morning sickness may appear near the end of this week: reduced appetite, occasional nausea, sometimes a day or two of genuine pickiness. It's usually mild and self-limiting. Tell your vet if she stops eating entirely.

What to do: book the ultrasound. Keep feeding normally.

Week 5 (Days 29–35): Growth Accelerates

Fetal development speeds up considerably and the abdomen may begin to thicken slightly. Appetite typically returns and then some.

This is when nutrition changes. Most veterinarians advise gradually increasing food from around here, often transitioning toward a puppy or performance formula with higher calorie and protein density. Increase gradually rather than all at once, and follow your vet's guidance on amounts — overfeeding in pregnancy contributes to oversized puppies and harder whelpings, which is the opposite of helpful.

Week 6 (Days 36–42): Visibly Pregnant

Abdominal enlargement becomes obvious, mammary development begins, and nipples darken and enlarge. She may start slowing down.

What to do: continue increasing food, often splitting into more frequent smaller meals as abdominal space shrinks. Keep exercise gentle and regular — fitness matters for whelping stamina, but this is not the time for anything strenuous.

Week 7 (Days 43–49): Count the Puppies

Fetal skeletons calcify around days 45 to 50, which means an X-ray can finally give you an accurate puppy count.

Get one. A count is not a curiosity — it tells you when whelping is finished. Without it, you're guessing whether the bitch who has produced four puppies and stopped pushing is done or has a fifth stuck. That single piece of information can be the difference between a routine night and a preventable loss.

She may begin shedding belly hair around the mammary area, which is normal and makes nursing easier.

Week 8 (Days 50–56): Set Up and Settle In

Set up the whelping box now. Two weeks of lead time lets her investigate, sleep in it, and accept it as hers. A bitch who hasn't settled into the box will choose her own spot, and her taste runs to closets, under decks, and the middle of your bed. Our whelping box guide covers sizing and setup.

Milk may be expressible late in this week. She'll likely become restless and start nesting behaviors — digging, shredding bedding, rearranging.

Start twice-daily temperature checks around day 55. Establish her baseline now so you'll recognize the drop when it comes. Assemble your whelping supplies this week, not next.

Week 9 (Days 57–65): Whelping Watch

From about day 58, puppies are generally viable. Anything from here is a normal arrival.

The temperature drop is your best warning: a sustained fall below roughly 99°F (37.2°C) typically precedes labor within about 24 hours. Nesting intensifies, she may refuse food, and she'll often become clingy or conversely want to hide.

Day 63 is the average. Anywhere from 58 to 68 days counting from breeding is within normal range. Know the signs of labor before you need them, and have your vet and emergency clinic numbers written down on paper.

If she reaches roughly day 65 to 66 with no signs, call your vet. Most want to evaluate at that point even absent distress.

A Quick Reference

Days from ovulation	What happens	What you do
0–14	Fertilization, implantation	Record the date; change nothing
21	Relaxin test possible	Ask your vet about confirming
25–30	Ultrasound, heartbeats	Confirm pregnancy
30–35	Growth accelerates	Begin increasing nutrition
45–50	Skeletons calcify	X-ray for a puppy count
50	Nesting instinct builds	Set up the whelping box
55	Pre-labor	Twice-daily temperature checks
58–68	Whelping window	Supplies ready, vet numbers on paper

Keep the Record

Every date here — breeding, confirmation, X-ray count, temperature readings, whelping — is worth recording, and not only for this litter. Across several litters, a dam's own pattern emerges: whether she runs early or late, how her counts trend, how her whelpings go. That history is what makes her next pregnancy predictable instead of improvised.

Breeders Companion keeps breedings, pregnancies, litters, and health records on one timeline per dog, so the pattern builds itself. Start with the pregnancy calculator for this litter's dates.

This article is for general education, not veterinary advice. Pregnancy monitoring, nutrition, imaging, and whelping decisions should be made with your veterinarian.