How do I calculate my dog's due date?

Add 63 days to the date of mating (or the middle date if multiple matings occurred). This gives the average due date, with a whelping window of a few days either side.

When should I take my dog to the vet during pregnancy?

Schedule a veterinary check-up after mating, an ultrasound around day 25-30, and another visit in the final weeks. Contact your vet immediately if you notice unusual discharge, lethargy, or signs of distress.

🤰 Canine Reproduction

Dog Pregnancy Calculator

Estimate your dog's due date, track weekly milestones, and get veterinary-approved care tips for a healthy pregnancy and smooth whelping.

Date of Mating If mating occurred over multiple days, use the middle date

Breed Size Helps estimate litter size and care needs

Estimated Due Date

📅 Mating Date --

⏳ Gestation Length 63 days (average)

📆 Current Stage --

🐶 Breed Size --

Pregnancy Timeline — Week by Week

Note: Average gestation is 63 days (58–72 days range). Due date may vary based on litter size and individual factors.

Pregnancy Stages & Key Milestones

Weeks 1–2

Fertilization & implantation
Embryos enter uterus by day 11, implantation occurs days 16–18. No visible signs yet.

Weeks 3–4

Organ formation
Ultrasound can detect pregnancy from ~day 25. Nipples may enlarge slightly.

Weeks 5–6

Rapid fetal growth
Belly grows, mammary glands develop, milk may appear from week 5[reference:6]. Puppies begin to move.

Weeks 7–9

Final preparation
Skeleton visible on X-ray ~day 45. Nesting behavior, weight gain, and pre-labor signs.

📌 Veterinary Reference: The average gestation period for dogs is approximately 63 days (about 9 weeks), but can range from 58 to 72 days. Always consult your veterinarian for confirmation of pregnancy and personalized care advice. Ultrasound can detect pregnancy from around day 25 after mating.

Understanding Dog Pregnancy

How Long Are Dogs Pregnant?

The average gestation period for dogs is approximately 63 days (about 9 weeks) from the time of ovulation. However, the due date can vary between 58 and 72 days depending on the individual dog, litter size, and other factors. Larger litters tend to be born slightly earlier.

Signs of Pregnancy in Dogs

Early signs (weeks 1–4): Slightly enlarged, pinker nipples; swollen vulva; subtle behavior changes
Mid-pregnancy (weeks 5–6): Weight gain, firm round belly, mammary gland development, increased appetite
Late pregnancy (weeks 7–9): Nesting behavior, milk production, visible puppy movement, restlessness

Veterinary Care During Pregnancy

Confirmation: Ultrasound from day 25–30 can confirm pregnancy[reference:22]; blood tests detect relaxin from day 20–26
Monitoring: Regular vet check-ups throughout pregnancy; X-rays around day 45 can estimate litter size
Nutrition: Switch to high-quality puppy food in the third trimester for extra calories and nutrients
Deworming: Your vet may recommend deworming 10 days before whelping and during nursing

Nutrition & Exercise Guidelines

Feeding: A pregnant dog's appetite increases significantly, especially in the second half of pregnancy. She may eat 2–3 times more than normal. Feed a high-quality puppy food or food specifically for pregnant/lactating dogs. Offer smaller, more frequent meals as the growing womb presses on the stomach.

Exercise: Moderate exercise helps maintain muscle tone for whelping[reference:30]. Avoid strenuous activity after 4–6 weeks of pregnancy. Let your dog set the pace and allow plenty of rest, especially in the final weeks.

Important: Do not supplement calcium without veterinary supervision — it can cause metabolic imbalances. Consult your vet before giving any medications or flea/tick products during pregnancy.

Potential Complications to Watch For

Pre-eclampsia (Eclampsia): Low blood calcium — signs include restlessness, stiff gait, panting, disorientation. Medical emergency.
Gestational diabetes: Excessive drinking, urination, weight loss despite increased appetite
Mastitis: Inflamed mammary glands, painful breasts, often occurs after delivery
Miscarriage: Unusual discharge, lethargy, abdominal pain, or loss of pregnancy signs
Pregnancy toxaemia: Low energy, weakness, wobbliness, collapse in severe cases

When to call the vet immediately: Any unusual vaginal discharge (including bleeding or foul-smelling discharge), signs of pain or distress, lethargy, or if your dog seems unwell at any point during pregnancy.

False Pregnancy (Phantom Pregnancy)

False pregnancy is common in dogs — they may show signs of pregnancy (weight gain, nesting, milk production, even labor) without being pregnant. This is caused by hormonal changes after a heat cycle. Signs usually resolve within three weeks. Consult your vet if you're concerned.

Frequently Asked Questions

The average gestation period for dogs is approximately 63 days (about 9 weeks), but it can range from 58 to 72 days. Litter size can affect timing — larger litters tend to be born slightly earlier.

Add 63 days to the date of mating (or the middle date if breeding occurred over multiple days). This gives the average due date, with a whelping window of a few days either side because the exact day of conception is rarely known to the day.

Schedule a vet visit after mating for initial advice. An ultrasound can confirm pregnancy from around day 25[reference:51]. Another check-up in the final weeks is recommended. Contact your vet immediately if you notice unusual discharge, lethargy, signs of pain, or any concerning symptoms.

Feed a high-quality puppy food or food specifically for pregnant/lactating dogs. Her appetite may increase to 2–3 times normal by the end of pregnancy. Offer smaller, more frequent meals as the growing womb presses on her stomach.

Yes, moderate exercise helps maintain muscle tone for whelping. Avoid strenuous activity after 4–6 weeks of pregnancy. Let your dog set the pace and allow plenty of rest, especially in the final weeks.

False (phantom) pregnancy is when a dog shows signs of pregnancy — weight gain, nesting, milk production, even labor — without being pregnant. It's caused by hormonal changes after a heat cycle and usually resolves within three weeks. Consult your vet if concerned.

Contact your vet immediately if you notice: unusual vaginal discharge (bleeding or foul-smelling), lethargy or depression, signs of pain, restlessness with stiff gait (possible eclampsia), excessive drinking/urination, or if she stops eating.

Litter size varies by breed. Toy breeds typically have 1–4 puppies, while larger breeds may have 8–12 or more. An X-ray around day 45 can give the most accurate estimate of litter size. Your vet can help determine this.