Dog Pregnancy Timeline: A Week-by-Week Guide

A dog's pregnancy lasts about 63 days — roughly nine weeks — and it moves fast. If your dog was recently bred (accidentally or on purpose), you'll want a clear roadmap of what to expect each week: how the puppies develop, when to change her food, which vet visits matter, and how to recognize labor when it starts.

This guide walks you through the full 63-day timeline, week by week, with practical checkpoints you can act on.

Before Week 1: Counting From the Right Date

Veterinarians count canine pregnancy from the day of breeding (mating or artificial insemination). If you know the breeding date, the math is simple: add 63 days to find the expected whelping date.

👉 Not sure of your due date yet? Use our free Dog Pregnancy Calculator — enter the breeding date and it instantly returns the due date, today's day-of-pregnancy, and a milestone timeline.

A few ground rules before the timeline starts:

• Normal canine gestation ranges from 58 to 68 days; 63 is the average. Anything outside that window deserves a vet call.
• Keep a breeding log: the date, and ideally a note from your vet confirming timing (progesterone testing improves accuracy).
• Schedule a pregnancy confirmation visit around day 25–30 — ultrasound can detect puppies from about day 25, and X-rays from about day 45 can count them.

Weeks 1–2 (Days 1–14): Fertilization and Implantation

In the first two weeks, fertilized eggs travel down the uterine horns and begin implanting into the uterine wall around day 16–18.

What you'll notice: Usually nothing. Most dogs behave completely normally. Some show mild "morning sickness" — decreased appetite or occasional vomiting around week 3, which mirrors human pregnancy and is generally harmless if brief.

What to do:

• Keep her routine exactly as it is — normal walks, normal food, normal play.
• Avoid dewormers, flea treatments, or vaccines not cleared by your vet; always tell your vet she may be pregnant before any medication.
• No strenuous activity changes yet; stress in early pregnancy is best avoided.

Weeks 3–4 (Days 15–28): Organs Begin to Form

This is the most developmentally sensitive period. Embryos implant fully, and the spinal cord, heart, and major organs start forming. By day 25, an experienced vet can spot heartbeats on ultrasound.

What you'll notice: Her nipples may become slightly pinker and more prominent. Some dogs get a briefly reduced appetite or mild lethargy.

What to do:

• Book the confirmation ultrasound (day 25–30). This confirms pregnancy, checks fetal heartbeats, and rules out pyometra (a serious uterine infection that can mimic pregnancy signs).
• Begin transitioning toward higher-quality nutrition if her current food is mediocre, but don't switch brands abruptly.
• Keep exercise moderate — walks are great; skip rough play and agility.

Weeks 5–6 (Days 29–42): Rapid Growth Phase

The puppies are now officially fetuses. Toes, whiskers, and claws form; sex organs differentiate; the skeleton begins to harden. This is when the mother's nutritional demands start climbing noticeably.

What you'll notice: Her waist thickens, and she may begin eating more eagerly. Some dogs get picky instead, due to uterine pressure on the stomach.

What to do:

• Start increasing calories around day 35: aim for roughly 10% more per week, so she's eating about 35–50% above maintenance by whelping. Switching to a calorie-dense puppy formula food is the standard move — it's rich in the protein, fat, and calcium lactation will demand.
• Feed smaller, more frequent meals (3 per day) if she seems full quickly.
• Ask your vet about an X-ray around day 45–50: skull and spine mineralization makes puppies visible, and counting them tells you exactly how many to expect at birth — crucial for knowing when labor is truly complete.

👉 Feeding a pregnant dog is portion math, and our Dog Food Calculator can compute her updated daily calories as her weight changes through pregnancy.

Weeks 7–8 (Days 43–56): Final Stretch

Puppies grow rapidly now, gaining most of their birth weight. Their bones are fully mineralized (visible on X-ray), and they could survive if born early — though every extra day in the womb matters.

What you'll notice: Her belly is unmistakably distended. She may tire faster, nest (digging at blankets, seeking quiet corners), and her appetite may dip again as puppies crowd her stomach.

What to do:

• Set up the whelping box by day 50: a quiet, warm (22–26 °C), draft-free area with low sides she can step over but newborns can't. Line it with washable pads and let her sleep there so she associates it with safety.
• Keep food available in smaller, more frequent meals; she physically can't eat large portions.
• Continue gentle leash walks only. No off-leash romps — she's heavier, less agile, and close to term.
• Take her temperature daily if you want an early labor signal: a drop below about 37.8 °C (100 °F) often precedes labor by 12–24 hours.

Week 9 (Days 57–63+): Labor Approaches

In the final days, puppies shift into birth position. Milk may leak from nipples a day or two before whelping, and she may stop eating in the last 24 hours.

Signs labor is starting:

1. Temperature drop below 37.8 °C (usually 12–24 hours before)
2. Restlessness and nesting — pacing, digging, rearranging bedding
3. Panting, shivering, or refusing food
4. Vulvar discharge — clear mucus is normal; green/black discharge before any puppy is born is an emergency (placental separation)

Stage 1 labor (contractions begin, cervix dilates) lasts 6–12 hours. Stage 2 delivers puppies, typically one every 30–60 minutes, though pauses up to 2 hours between puppies can be normal if the mother is calm.

Call the vet immediately if: strong contractions last 30+ minutes with no puppy, more than 2 hours pass between puppies, green discharge appears before the first puppy, she seems weak or distressed, or you expected more puppies (per your X-ray count) and none arrive within 2 hours.

Week-by-Week Summary Table

Week	Days	Key Development	Your Action
1–2	1–14	Fertilization, implantation begins	Keep routine; avoid unapproved meds
3–4	15–28	Organs form; heartbeats detectable	Confirmation ultrasound (day 25–30)
5–6	29–42	Toes, whiskers, skeleton start	Start calorie increase; X-ray possible (day 45+)
7–8	43–56	Rapid growth; bones mineralized	Whelping box ready; X-ray puppy count
9	57–63+	Birth positioning; labor signs	Daily temperature; watch for labor cues

Nutrition and Vet-Visit Checklist at a Glance

• Day 0: Note breeding date; run the due-date calculation
• Day 25–30: Ultrasound confirmation
• Day 35+: Begin gradual calorie increase; consider puppy food
• Day 45–50: X-ray to count puppies
• Day 50: Whelping box in place
• Day 57+: Daily temperature checks; vet on standby with your due date

Frequently Asked Questions

How long are dogs pregnant? About 63 days from breeding, with a normal range of 58–68 days. Counting from ovulation (via progesterone testing) is more precise than counting from mating.

How can I tell if my dog is pregnant early? Before day 25, there's no reliable home test. Ultrasound from day 25–30 confirms pregnancy; relaxation hormone tests exist but are less common. Watch for nipple changes and appetite shifts from week 3 onward.

How many puppies will my dog have? Litter size varies hugely by breed — from 1–4 in toy breeds to 10–12+ in large breeds. An X-ray after day 45 gives an exact count.

Should I switch her food during pregnancy? Yes, around day 35: transition to a high-quality puppy or performance formula over 7–10 days, and increase total calories gradually until she's eating 35–50% above her normal intake by whelping. Keep the same elevated feeding through lactation, when energy needs can double or triple.

When should I call the vet during pregnancy? For vomiting lasting more than a day, bloody or foul discharge, lethargy, appetite loss over 24 hours, or any sign of distress. During labor, use the emergency criteria above — when in doubt, call; vets expect these calls.

Should I limit my pregnant dog's contact with other dogs? It's sensible to keep her away from unfamiliar dogs, especially in the final weeks — stress and infection risk aren't worth it, and you'll want her calm and rested heading into whelping. Her regular household companions are fine.

Can a dog go overdue? Yes — day 68 is still within the normal window, but anything past day 68 (or two days beyond your vet's confirmed due date) warrants a call. Post-term pregnancies can signal incorrect dating or, rarely, a problem needing intervention.

Know Your Dates, Reduce the Stress

Most dog pregnancies proceed smoothly without intervention — your job is observation, nutrition, and knowing the warning signs. Everything starts with one number: the breeding date.

👉 Try our free Dog Pregnancy Calculator to get the due date, current day of pregnancy, and milestone timeline in seconds — no sign-up required.