Pregnancy Guide
Dog Pregnancy
Week by Week
From fertilisation to the first breath — a complete breeder's guide to all 9 weeks of canine pregnancy.
~63 days
Average gestation
9 stages
Covered in detail
Day 28
Earliest confirmation
Jump to week
Last reviewed:May 2026 · BreedTools Editorial Team · Sources cited at the end of the article. Veterinary references include Concannon (2011), England (2018), Greco (2008), and Drobatz & Casey (2000).
Understanding canine gestation
Dog pregnancy lasts approximately 63 days from ovulation — but most breeders count from the mating date, which creates variability. Understanding your dog's heat cycle and ovulation timing is key, since whelping anywhere between Day 58 and Day 68 is considered normal.
The 9-week journey from fertilisation to birth is surprisingly fast. In the first 3 weeks, there are no outward signs at all. By Week 5, growth accelerates dramatically. By Week 7, the puppies are fully formed — just growing larger and preparing to breathe air.
Use the Whelping Date Calculator to get your exact predicted due date, and the Whelping Date Calculator to track where you are in the timeline right now.
Week-by-week
Canine Pregnancy Timeline
~63 days from ovulation · Tap a week for details
Visible progression
Dam profile through pregnancy
Most dams show no outward signs until week 5. Belly enlargement, nipple darkening, and posture changes accelerate from week 5 through whelping.
Week 1
No visible change
Week 3
Nipples may pink
Week 5
Slight rounding
Week 7
Obvious belly
Week 9
Full pre-whelp
Interactive — pick size, click a week
Expected dam weight gain through pregnancy
Healthy dams typically gain 25–30% over baseline by week 9. Smaller breeds tend toward the high end.
Calories: +25%
Switch to puppy/all-life-stages food. Increase intake +25%.
Watch for: Excessive gain (over 35%) raises dystocia and obesity risk. Insufficient gain (under 15% by week 9) may indicate resorption, single-puppy pregnancy, or undernutrition. Discuss any concerns with your vet.
Pregnancy at a glance
This table summarizes the key milestones, diagnostic windows, and breeder actions for each week of canine pregnancy.
| Week | Days | Key Development | Breeder Action |
|---|---|---|---|
| 1 | 1–7 | Fertilisation, cell division, blastocyst formation | Record mating date(s), maintain normal routine |
| 2 | 8–14 | Embryos implant into uterine wall, placenta forming | Continue normal feeding, avoid stress/travel |
| 3 | 15–21 | Organ formation begins, embryos ~5mm | No outward signs yet — maintain baseline care |
| 4 | 22–28 | Spinal cord, eyes, face forming; heartbeat detectable | Ultrasound confirmation possible (day 25–28) |
| 5 | 29–35 | Toes, claws, whiskers form; rapid growth begins | Increase food 25%, switch to puppy/all-life-stages formula |
| 6 | 36–42 | Pigmentation, skeleton hardening; dam visibly pregnant | Reduce vigorous exercise, prepare whelping supplies |
| 7 | 43–49 | Puppies fully formed, fur developing | X-ray for puppy count (day 45+), set up whelping box |
| 8 | 50–56 | Lungs maturing, puppies shifting into position | Start twice-daily temp checks, finalize vet contact plan |
| 9 | 57–65 | Whelping — puppies delivered | Monitor labor stages, log births, weigh each puppy |
Approximate timelines based on ovulation date. Individual variation is normal.
Fertilisation & Cell Division
The Dam
No visible signs. The dam acts completely normal. Fertilisation occurs within the first 24–48 hours after mating. Eggs travel toward the uterine horns while beginning to divide.
Puppy Development
Sperm meets egg and a zygote forms. Cells begin dividing rapidly — from 2 to 4 to 8 cells. By day 7, the embryos are tiny blastocysts floating freely in the uterine fluid, not yet implanted.
What to do this week
- Record the exact mating date(s) — this anchors your entire timeline
- Keep the dam calm and avoid high-impact exercise
- Do not start any medications or supplements without vet guidance
- Ensure she is on a complete, high-quality diet
Red flags this week — call your vet
- Heavy bleeding (more than light spotting)
- Foul-smelling vaginal discharge
- Lethargy paired with fever above 103°F
Implantation Begins
The Dam
Still no outward signs. Some dams experience a very subtle appetite change or become slightly clingy, but this is not universal.
Puppy Development
The blastocysts travel down the uterine horns and begin implanting into the uterine wall around day 12–14. Each embryo nestles into its own implantation site. The placenta begins to form.
What to do this week
- Continue normal feeding — no caloric increases yet
- Avoid unnecessary stress, boarding, or travel
- Do not give flea/tick products unless already prescribed and confirmed safe during pregnancy
- Note any subtle behaviour changes
Red flags this week — call your vet
- Persistent vomiting (more than once or twice in a day)
- Refusal to eat or drink for 24+ hours
- Vaginal discharge with strong odor or unusual color
Embryos Develop Rapidly
The Dam
Some dams experience mild 'morning sickness' — reduced appetite, occasional vomiting, or lethargy. This is progesterone-driven and usually passes by Week 4.
Puppy Development
Major organ development begins. The embryos grow to about 1 cm. The nervous system, spinal cord, and basic body structures start forming. The heartbeat may be detectable by ultrasound toward the end of this week.
What to do this week
- If your dam is off food, offer small, frequent meals
- Schedule a vet appointment for Week 4 ultrasound confirmation
- Begin researching whelping supplies if you haven't already
- Start tracking her weight weekly
Red flags this week — call your vet
- Vomiting blood or with bile streaks
- Severe lethargy (more than mild appetite dip)
- Bloody vaginal discharge — could indicate resorption
Pregnancy Confirmed by Ultrasound
Vet milestone this week
Ultrasound day 25–30 — confirm pregnancy + estimate litter size
The Dam
The abdomen may feel slightly firmer. Nipples begin to enlarge and become more pink ('pinking up'). Appetite usually returns after the Week 3 dip.
Puppy Development
Embryos are now approximately 1.5–2 cm. Facial features begin forming — eyes, nose, and limb buds are visible. Organ systems continue developing rapidly. Heartbeats are detectable by ultrasound.
What to do this week
- Schedule and attend your Week 4 ultrasound — confirms pregnancy and estimates litter size
- Begin a gradual calorie increase (about 10% more than baseline)
- Switch to a high-quality puppy or all-life-stages food if not already
- Note pup count from ultrasound (not perfectly accurate, but a useful estimate)
Red flags this week — call your vet
- Ultrasound shows no heartbeats — possible resorption or false pregnancy
- Sudden abdominal swelling without pregnancy confirmation — pyometra warning
- Bright red bleeding — flag for resorption / threatened pregnancy
- High fever (above 103°F) with abdominal pain — emergency
Rapid Growth Phase
Vet milestone this week
Switch to puppy/all-life-stages food; +25–30% calories
The Dam
Noticeable weight gain begins. Abdomen becomes visibly rounder. Nipples are clearly enlarged. Appetite increases significantly. The dam may become more tired.
Puppy Development
The embryos are now called fetuses. Toes, claws, and whisker pads form. The puppies' sex organs develop this week. By end of Week 5, each pup is about 2.5–3 cm. Skeletal structure begins mineralising.
What to do this week
- Increase food by 25–30% over baseline — divide into 3 meals per day
- Ensure fresh water is always available
- Reduce strenuous exercise — gentle walks are ideal
- Begin setting up the whelping area so the dam can become familiar with it
Red flags this week — call your vet
- No weight gain by end of week 5 — possible resorption or single-puppy litter
- Belly suddenly drops or shrinks — flag for resorption
- Vaginal discharge changes color (green/black before labor is wrong stage)
- Refusal to eat for 48+ hours despite caloric needs
Puppies Become Recognisable
Vet milestone this week
Mid-pregnancy check + safe-for-pregnancy deworming
The Dam
Significant abdominal enlargement — you may feel puppy movement if you place your hand gently on her belly. She may begin nesting behaviour. Colostrum can sometimes be expressed from nipples.
Puppy Development
Puppies now look like miniature dogs. Pigmentation begins in the skin. Eyes are formed but fused shut. The skeleton continues hardening and can now be detected on X-ray (though 45+ days is more reliable for counting).
What to do this week
- Consider a mid-pregnancy vet check to confirm all is progressing normally
- Worm the dam with a vet-recommended wormer safe for pregnancy (e.g. fenbendazole/Panacur)
- Begin assembling your whelping kit — this is urgent now
- Limit rough play with other dogs
Red flags this week — call your vet
- No fetal movement detectable when palpating belly — flag for vet ultrasound
- Excessive panting at rest (heat distress vs labor)
- Sudden weight loss
- Yellow/green/brown vaginal discharge
Puppies Are Fully Formed
Vet milestone this week
X-ray day 45–50 for accurate puppy count
The Dam
Obvious, heavy abdomen. The dam will move more slowly and tire easily. Nesting behaviour intensifies. She may refuse food 24 hours before labour. You may see and feel individual puppy movements clearly.
Puppy Development
All major organ systems are complete. The puppies are just growing larger and their lungs are maturing for air-breathing. Hair coat develops. Brain activity is present. Each pup has a detectable heartbeat and distinct paw pads.
What to do this week
- Schedule a Day 45–50 X-ray for an accurate pup count — crucial to know when whelping is complete
- Confirm whelping area is clean, warm (85–90°F for newborns), and private
- Have your emergency vet number saved — know what a C-section threshold looks like for your breed
- Begin taking daily rectal temperature readings
Red flags this week — call your vet
- Going into labor too early — contractions before day 58 = premature labor (vet emergency)
- Discharge with foul odor (not clear/clear-pink)
- Inability to walk comfortably (potential prolapse or pelvic distress)
- Tremors, twitching, or weakness — eclampsia early signs
Pre-Whelp Preparation
Vet milestone this week
Twice-daily rectal temp from day 57 onward
The Dam
The dam enters pre-whelp mode. She may isolate herself, pant frequently, dig, shred bedding, or refuse food. Her abdomen may appear to 'drop' slightly as puppies shift into position. Milk may come in.
Puppy Development
Puppies are large and fully developed. Their lungs are maturing and they are turning into birthing position. Average gestation is 63 days — but births between Day 58 and Day 68 are considered normal in most breeds.
What to do this week
- Take rectal temp twice daily — a sustained drop below 99°F (37.2°C) signals labour within 12–24 hours
- Set up a monitoring station near the whelping box
- Prepare puppy supplies: heating pad, clean towels, iodine, weight scale, milk replacer on standby
- Alert your vet that birth is approaching
Red flags this week — call your vet
- Temp drop below 99°F + active labor not starting within 24 hours — call vet
- Green or black vaginal discharge before any puppy is born — placental separation, emergency
- Active straining for more than 30 minutes with no puppy delivered — emergency
- Trembling/seizures — eclampsia (low calcium), needs immediate vet care
Whelping Day
Vet milestone this week
Vet on standby; emergency C-section threshold known
The Dam
Active labour begins with visible contractions. Each puppy is typically born 20–60 minutes apart. The dam will tear the sac, sever the cord, and stimulate each pup by licking. Placentas are delivered with each pup or shortly after.
Puppy Development
Puppies arrive! Newborns weigh anywhere from 100g (small breeds) to 500g+ (large breeds). They cannot regulate their own temperature and rely entirely on the dam and environment. Eyes and ears are sealed shut.
What to do this week
- Keep a written log: time born, birth order, weight, any complications, placenta passed (yes/no)
- If the dam misses a sac, tear it yourself from the nose first within 30–60 seconds
- Weigh each puppy at birth and again at 12 and 24 hours
- If a pup isn't nursing within 2 hours, assist or tube-feed
- Contact your vet immediately if: active straining for >30 min with no pup, or >4 hours between pups
Red flags this week — call your vet
- More than 4 hours between puppies during active labor — emergency C-section likely
- Active straining 30+ minutes with no puppy — call vet NOW
- Green/black discharge before first puppy — placental separation, vet emergency
- Retained placenta (placenta count doesn't match puppy count) — life-threatening metritis risk
- Dam is unresponsive, weak, or has pale gums — emergency
- Excessive bleeding after delivery (more than light pink discharge for 24+ hours)
References & further reading
The week-by-week timing, fetal development markers, and clinical thresholds in this article are drawn from the following veterinary sources:
- England GCW. Allen's Fertility and Obstetrics in the Dog, 4th Edition. Wiley-Blackwell (2018). — Standard veterinary obstetrics reference covering implantation timing, fetal development stages, and parturition.
- Concannon PW. Reproductive cycles of the domestic bitch. Animal Reproduction Science (2011) 124:200–210. — Canonical reference on canine pregnancy length, hormonal events, and the pre-whelp temperature drop signaling labor.
- Concannon PW, McCann JP, Temple M. Biology and endocrinology of ovulation, pregnancy and parturition in the dog. Journal of Reproduction and Fertility Supplement (1989) 39:3–25. — Foundational research on canine reproductive endocrinology.
- Greco DS. Pregnancy nutrition in dogs and cats. Compendium on Continuing Education for the Practicing Veterinarian (2008) 30(8):408–416. — Caloric and nutritional requirements through gestation.
- Drobatz KJ, Casey KK. Eclampsia in dogs: 31 cases (1995–1998). Journal of the American Veterinary Medical Association (2000) 217(2):216–219. — Clinical study of eclampsia (puerperal hypocalcemia) in pregnant and lactating dogs.
- American Kennel Club. Breeder Guide to Pregnancy and Whelping. akc.org — Practical guidance from the AKC on breeding management, dam care, and whelping preparation.
- American College of Theriogenologists. Position on Canine Reproduction. theriogenology.org — Professional standards for breeding, pregnancy management, and reproductive testing.
Tools for this pregnancy
Plan every stage with free calculators
Related guides
How to care for newborn puppies
Warmth, feeding, weight monitoring, and what to watch for in week one.
Read article →
Newborn puppy weight chart
Expected weight ranges by breed size and what healthy gain looks like.
Read article →
All pregnancy & whelping articles
Browse the full collection of whelping and postnatal guides.
Read article →
Understanding heat cycles
When to breed, how to time ovulation, and what to expect each cycle.
Read article →
Frequently asked questions
1How long is a dog pregnant?
The average gestation period is 63 days from ovulation, but normal whelping can occur anywhere from Day 58 to Day 68. The variability is partly because the exact moment of ovulation is rarely known precisely.
2When can pregnancy be confirmed?
Ultrasound can confirm pregnancy and detect heartbeats from around Day 25–28. Blood relaxin testing can confirm pregnancy from Day 21–25. X-rays are not recommended before Day 45 as the skeleton isn't yet mineralised.
3What are the first signs of dog pregnancy?
Early signs are subtle: nipple enlargement beginning around Week 3–4, mild appetite changes, and slightly increased clinginess. By Week 5–6, visible abdominal swelling becomes apparent. The most reliable confirmation is a vet ultrasound at Day 28.
4How much should I feed a pregnant dog?
For the first 4 weeks, maintain normal feeding. From Week 5, gradually increase intake by 25–50% over the final third of pregnancy. Switch to a high-quality puppy or all-life-stages formula. Divide meals into 2–3 feedings daily.
5What exercises are safe during dog pregnancy?
Gentle daily walks are ideal throughout pregnancy. Avoid high-impact activities, jumping, rough play, and prolonged exertion from Week 5 onwards. In the final two weeks, short, calm walks are preferable.
6When should I set up the whelping box?
The whelping box should be introduced by Week 6–7 at the latest. The dam needs time to become comfortable with it as her safe space before labour begins.
7What is the temperature drop before whelping?
Normal canine rectal temperature is 101–102.5°F (38.3–39.2°C). In the 12–24 hours before active labour, it typically drops below 99°F (37.2°C). Taking twice-daily temperature readings from Day 57 onwards allows you to catch this drop reliably.
Related Tools
Sources: Concannon PW. Reproductive cycles of the domestic bitch. Animal Reproduction Science (2011) 124:200–210; Merck Veterinary Manual (Canine Pregnancy; Fetal Development); BSAVA Manual of Canine and Feline Reproduction and Neonatology (England GCW, von Heimendahl A eds.); Linde-Forsberg C. Veterinary Clinics of North America: Small Animal Practice; Johnston SD, Root Kustritz MV, Olson PNS. Canine and Feline Theriogenology. Saunders; AKC Canine Health Foundation. Gestation-day landmarks measured from the LH surge (ovulation occurs ~2 days later); breeding-date dating carries a 5–7 day uncertainty. This article is for educational purposes and does not replace professional veterinary care.