Dog Pregnancy Calculator — Due Date & Week-by-Week Tracker
Calculate your bitch’s due date from the mating date using the veterinary standard 63-day canine gestation (range 58–68 days). The interactive milestone timeline below covers progesterone testing, ultrasound and x-ray windows, whelping-box prep and the rectal-temperature drop that signals labor. See the AKC dog pregnancy guide for the full breeder workflow.
Calculator
Gestation: 58–68 days (avg 63).
d1–212nd trimester
d22–423rd trimester
d43–63
Upcoming milestones
- Fertilization completeEggs fertilized; embryos begin dividing.Day 7May 23, 2026
- Blastocysts travel to uterusEmbryos attach to the uterine horn.Day 14May 30, 2026
- ImplantationPlacenta begins to form.Day 21June 6, 2026
- Ultrasound windowBest time to confirm pregnancy via ultrasound and count heartbeats.Day 28June 13, 2026
- Fetal development visibleLimbs, toes, and internal organs forming.Day 35June 20, 2026
- X-ray visibilityPuppy skeletons calcify — x-ray can count puppies accurately.Day 45June 30, 2026
- Milk let-down may beginNipples enlarge; colostrum may be visible.Day 55July 10, 2026
- Earliest safe whelping datePuppies born before this date may need extra care.Day 58July 13, 2026
How long is a dog pregnancy?
Canine gestation lasts, on average, 63 days from the day of fertilization, with a normal whelping window of 58 to 68 days from the date of mating. Because ovulation can occur 2–4 days after mating, counting from the mating date can add 2–3 days of uncertainty. For tighter accuracy, breeders use progesterone testing to identify ovulation; the whelping date is then ovulation day + 63.
Small breeds (toy, small) often deliver on day 58–62, while medium and large breeds tend to deliver at day 63–68. Singleton puppies may gestate slightly longer because the single fetus can't trigger labor hormones as effectively as a multi-puppy litter.
What does each week of canine gestation look like?
| Week | Key event | Owner action |
|---|---|---|
| 1 (days 0–7) | Fertilization and embryo division | Continue normal diet. |
| 2 (8–14) | Embryos travel to uterus | Avoid vaccines and medications. |
| 3 (15–21) | Implantation; morning-sickness-like nausea possible | Monitor appetite. |
| 4 (22–28) | Fetal heartbeats detectable via ultrasound | Schedule confirmation ultrasound. |
| 5 (29–35) | Abdomen visibly rounds | Start increasing food 25 %. |
| 6 (36–42) | Skin pigmentation of fetuses; colostrum may appear | Switch to puppy/performance food. |
| 7 (43–49) | X-ray can count puppies | X-ray appointment to count puppies. |
| 8 (50–56) | Milk glands enlarge; nesting begins | Introduce whelping box. |
| 9 (57–63) | Labor imminent | Monitor rectal temp 2× daily. |
What are the signs your dog is going into labor?
Most owners spot labor before contractions start by tracking rectal temperature. See the Merck Veterinary Manual on parturition for the full clinical workup.
- Temperature drop below 99°F (37.2°C), 12–24 hours before stage-1 labor.
- Restlessness, panting, pacing — early stage 1.
- Refusing food and nesting intensification.
- Visible contractions (stage 2) — first puppy usually within 1–2 hours.
- Green discharge — normal during active labor. Call your veterinarian if it appears without a puppy within 30–60 minutes.
Mating-date vs progesterone-test due date: which is more accurate?
Hobby breeders typically count from the mating date; professional breeders use progesterone-timed ovulation. Both methods aim at the same biological event — fertilization — but differ in precision.
| Aspect | Mating-date method | Progesterone-timed method |
|---|---|---|
| Counting from | First confirmed mating | Lab-measured ovulation day |
| Accuracy of due date | ± 5 days | ± 1 day |
| Cost | Free | $60–150 for 2–4 tests |
| Whelping window | Days 58–68 from mating | Day 63 ± 1 from ovulation |
| Best for | Single pet pregnancy | Planned breeding, c-section scheduling |
Canine pregnancy terms — quick reference
- Gestation
- Period from conception to whelping; averages 63 days in the bitch.
- Whelping
- Veterinary term for the act of giving birth to a puppy litter.
- Relaxin
- A pregnancy-specific hormone detectable from day 25; the most reliable blood-test marker of canine pregnancy.
- Stage-1 labor
- Cervical dilation phase — 6–12 hours of restlessness, panting and nesting before visible contractions begin.
- Stage-2 labor
- Active expulsion phase. First puppy usually arrives within 1–2 hours of visible contractions; subsequent pups every 30–60 minutes.
Frequently Asked Questions
How long is a dog pregnancy?
Dog gestation averages 63 days (9 weeks), with a normal range of 58–68 days from the day of mating. Small breeds tend toward the shorter end, large breeds toward the longer end.
How accurate is the dog pregnancy due date?
A due date calculated from mating date is accurate to within 5 days, because ovulation can occur 2–4 days after mating. Progesterone-based ovulation timing is more accurate to ±1 day.
When can you tell if a dog is pregnant?
A veterinary ultrasound can confirm pregnancy from day 28. Relaxin blood tests work from day 25. Palpation is reliable only from day 28–35, and x-ray from day 45 when puppy skeletons calcify.
What are signs a dog is going into labor?
Rectal temperature drops below 99°F (37.2°C) 12–24 hours before labor. The dam may refuse food, dig or pant heavily. Stage 1 labor (restlessness, contractions) lasts 6–12 hours before the first puppy.
Can dogs deliver early?
Puppies born before day 58 are premature and often require intensive care. Survival improves significantly after day 58. Contact your vet if labor starts before this.
How many puppies will my dog have?
Litter size varies by breed and dam size — toy breeds average 1–3 puppies, medium breeds 4–6, large breeds 6–10, and some giant breeds 10+. X-ray on day 45+ gives an accurate count.
Should I feed my pregnant dog more?
Nutritional needs don't increase significantly until week 5. From week 5 onward, increase food gradually (up to 25–50 % more by week 9). Switch to a high-quality puppy or performance formula.
When do I set up the whelping box?
Introduce the whelping box around day 55–60 so the dam acclimates. Place in a quiet, warm, familiar area away from other pets.
What should I monitor in the last week?
Take rectal temperature twice daily starting day 58. Track nipple enlargement, milk let-down, and behavior changes. Prepare whelping kit (towels, thermometer, bulb syringe, scale, vet phone number).
Sources & References
- [1]Canine pregnancy — Merck Veterinary Manual
- [2]Canine Breeding and Reproduction — American Kennel Club
- [3]Parturition in the bitch — Royal Canin Veterinary Focus
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