Dog Pregnancy Calculator - Whelping Date | LazyTools

Dog Pregnancy Calculator

Calculate your dog's whelping date instantly — enter the mating date and get the puppy due date, current gestational stage and week-by-week canine pregnancy timeline. Works for all breeds.

63-day avg gestation Whelping date Week-by-week stages Breed adjustment notes

Dog Gestation Calculator Tool

Enter breeding date
Reset
Normal gestation range: 58–68 days.
Average: 63 days.
Small breeds like Chihuahuas often deliver slightly early (58–60 days), while large breeds like Great Danes may go to 65–68 days. Count from ovulation for most accurate results.
Enter the mating date and click Calculate
Expected whelping date
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Days elapsed
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Days remaining
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Gestation length
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Used for this calculation
Expected litter
5–8 puppies average (1–15 depending on breed)
Typical for dog
Pregnancy progress
0%
Gestational stage
1
Fertilisation & Transport
Days 0–7
Eggs are fertilised and travel through the fallopian tubes.
2
Implantation
Days 8–16
Embryos implant in the uterine wall. No visible signs.
3
Organogenesis
Days 17–35
All major organs form. Morning sickness possible weeks 3–4.
4
Fetal Development
Days 36–50
Coat, claws and gender become distinguishable. Belly enlarges.
5
Pre-Whelping
Days 51–63
Puppies move into birth position. Temperature drops 24 h before whelping.
Looking for another animal gestation calculator?
LazyTools has free gestation calculators for 10 animals. Try the Cat Pregnancy Calculator next.
Cat Pregnancy Calculator →
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Features

Why use this free dog gestation calculator?

This tool does more than just calculate a due date — it gives you the complete gestational stage breakdown, current development notes and care timeline that most other tools leave out.

📅
Accurate due date calculation
Enter the mating date and get the expected whelping date based on the 63-day average gestation, with early and late estimate options.
📈
Gestational stage with progress bar
See exactly which of the 5 gestational stages your animal is currently in, with a visual progress bar showing how far through the pregnancy you are.
🔍
Days elapsed and remaining
Know exactly how many days have passed since mating and how many days remain until the expected whelping date.
🪨
Breed adjustment option
Choose early (58 days), average (63 days) or late (68 days) gestation to account for breed variation and individual differences.
📋
Signs and symptoms guide
Full checklist of pregnancy signs and pre-whelping indicators so you know what to watch for at every stage.
🔒
100% free and browser-based
No registration, no app download, no personal data collected. Works on desktop, tablet and mobile. Results instantly in your browser.
How to use

How to calculate your dog's due date

1
Enter the mating or breeding date
Select the date the mating took place using the date picker. If mating occurred over multiple days, use the first confirmed mating date for the earliest estimate or the last date for the latest.
2
Select the gestation adjustment
Choose from average (63 days), early estimate (58 days), or late estimate (68 days) to account for breed or individual variation. The average is the best starting point.
3
Click Calculate Due Date
The calculator instantly shows the expected whelping date, days elapsed, days remaining, pregnancy progress bar and the current gestational stage with development notes.
4
Monitor the pregnancy signs
Use the signs and symptoms section below to know what to watch for as the pregnancy progresses and begin your pre-whelping preparations in the final stage.
Reference

Dog gestation timeline — stage by stage

PeriodStageKey events & signs
Week 1 (Days 1–7)FertilisationEggs fertilised; travel to uterus
Week 2 (Days 8–16)ImplantationEmbryos attach to uterine wall
Week 3 (Days 17–21)Organ formationMorning sickness possible; nipples enlarge
Week 4 (Days 22–28)Major developmentClear discharge; ultrasound confirms pregnancy
Week 5 (Days 29–35)Coat & claws formSwitch to puppy food; belly visible
Week 6 (Days 36–42)Gender distinguishableAppetite increases; reduce high-impact exercise
Week 7 (Days 43–49)Skeleton hardensPuppies can be felt; prepare whelping box
Week 8 (Days 50–56)Near full termX-ray for puppy count at day 55
Week 9 (Days 57–63)Pre-whelpingTemperature monitor twice daily

Signs of whelping approaching:

  • Clear vaginal discharge at week 4
  • Enlarged nipples from week 3
  • Morning sickness weeks 3–4
  • Belly rounds by week 5
  • Nesting 1 week before whelping
  • Temperature below 37.2°C within 24 h of birth

Pre-whelping care checklist:

  • Vet ultrasound at day 25–28 to confirm pregnancy
  • X-ray at day 55 to count puppies
  • Switch to puppy/performance food from week 5
  • Prepare whelping box by day 50
  • Reduce exercise in final 2 weeks
vs the competition

How this dog gestation calculator compares

Most free dog pregnancy calculators show only a due date. LazyTools provides the gestational stage breakdown, development notes and care checklist that make this a genuinely useful tool.

Feature LazyTools PetplanAKC.orgPetMD
Shows exact whelping date✓ ✓ ✓ ✓
Week-by-week stage breakdown✓ ✗ ✗ ✗
Development notes per stage✓ ✗ ✗ ✗
Breed variation adjustment✓ ✗ ✗ ✗
Signs & symptoms guide✓ ✗ ✗ ✗
Whelping preparation checklist✓ ✗ ✗ ✗
Complete guide

Dog Gestation Period: Complete Guide

How long is a dog pregnant? The complete canine gestation timeline

See the interactive calculator above for a personalised dog gestation timeline based on your specific breeding date. The information below provides the complete background on dog pregnancy.

Dog pregnancy stages week by week

See the interactive calculator above for a personalised dog gestation timeline based on your specific breeding date. The information below provides the complete background on dog pregnancy.

Early signs of dog pregnancy: what to look for

See the interactive calculator above for a personalised dog gestation timeline based on your specific breeding date. The information below provides the complete background on dog pregnancy.

Dog gestation calculator: how to get the most accurate whelping date

See the interactive calculator above for a personalised dog gestation timeline based on your specific breeding date. The information below provides the complete background on dog pregnancy.

Breed differences in dog gestation period

See the interactive calculator above for a personalised dog gestation timeline based on your specific breeding date. The information below provides the complete background on dog pregnancy.

Feeding and caring for a pregnant dog

See the interactive calculator above for a personalised dog gestation timeline based on your specific breeding date. The information below provides the complete background on dog pregnancy.

Preparing for whelping: what every dog owner needs to know

See the interactive calculator above for a personalised dog gestation timeline based on your specific breeding date. The information below provides the complete background on dog pregnancy.

The dog gestation period averages 63 days, with a normal range of 58 to 68 days. Use the interactive dog gestation calculator above to calculate the expected whelping date from any mating date. The tool also shows you the current gestational stage, development milestones, and days remaining in the pregnancy.

Frequently asked questions about dog gestation

Dogs are pregnant for an average of 63 days from the date of ovulation, with a normal range of 58 to 68 days. Because mating can occur across multiple days, the whelping date is best estimated from ovulation testing.
The canine gestation period is approximately 9 weeks. Most dogs whelp between 8 and 10 weeks after mating.
Early signs of dog pregnancy include a clear vaginal discharge at week 4, enlarged nipples from week 3, reduced appetite or mild vomiting at weeks 3-4, and a visible belly enlargement from week 5.
Average litter size is 5-8 puppies, but this varies widely by breed. Small breeds typically have 1-4 puppies, while large breeds can have 10 or more. An X-ray at day 55 gives an accurate puppy count.
Schedule a vet visit at day 25-28 for ultrasound confirmation, then again at day 55 for an X-ray to count puppies and check positioning.
Switch to a high-quality puppy food or performance food from week 5 of pregnancy. Increase meal frequency to 3-4 small meals per day in the final weeks as the growing puppies compress the stomach.
Set up the whelping box by day 50. It should be large enough for the mother to stretch out, have low sides for easy entry, use washable bedding, and be placed in a quiet, warm, draft-free location.
Yes, especially in early pregnancy. A cryptic (silent) pregnancy is rare but possible. If you suspect your dog is pregnant, a vet ultrasound at day 25-28 is the most reliable early confirmation.
False pregnancy (pseudopregnancy) occurs when a dog shows pregnancy symptoms including milk production and nesting without being pregnant. It typically resolves on its own within 3 weeks.
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