Dog Pregnancy Calculator – Estimate Your Dog's Due Date

The average dog gestation period is 63 days from ovulation, though birth can occur anywhere between Day 58 and Day 68. Since pinpointing exact ovulation can be difficult, most breeders and pet owners count from the first mating date.

Formula: Mating Date + 63 Days = Estimated Due Date

Safe Birth Window: Mating Date + 58 days (earliest) to Mating Date + 68 days (latest)

Pro Tip: For the most accurate due date, ask your veterinarian to perform a progesterone test to identify the exact day of ovulation. This is more accurate than relying on the mating date alone.

What Is the Dog Gestation Period?

The canine gestation period is the time from fertilization to birth. In dogs, this period lasts an average of 63 days (approximately 9 weeks), though it can vary between 58 and 68 days. This is the same across all breeds — from tiny Chihuahuas to giant Great Danes — though individual variation exists.

Dogs go through three trimesters, each approximately 21 days long:

• First Trimester (Days 1–21): Fertilization and embryo implantation
• Second Trimester (Days 22–42): Rapid fetal development; visible changes begin
• Third Trimester (Days 43–63): Full fetal growth; preparation for birth

Dog Gestation Period by Breed Size

Dog Pregnancy Week by Week

Understanding what happens during each week of your dog's pregnancy helps you provide the right care at the right time. Here is a detailed dog pregnancy week by week breakdown covering puppy development, your dog's symptoms, and what actions you should take.

Week 1 (Days 1–7): Fertilization Begins

What's happening inside: Mating has occurred and fertilization takes place. The fertilized eggs begin traveling through the fallopian tubes toward the uterus. Cells begin dividing rapidly.

Signs in your dog: No visible signs. Your dog will behave completely normally. This is one of the most deceptive weeks of pregnancy.

What you should do:

• Note the exact mating date in your records
• Maintain normal feeding and exercise
• Avoid administering any medications, flea treatments, or dewormers without vet approval
• Consider scheduling a progesterone test if you haven't already — this confirms ovulation

Week 2 (Days 8–14): Embryo Implantation

What's happening inside: The developing embryos travel down into the uterus and begin to implant into the uterine lining around Day 10–14. The placenta begins to form.

Signs in your dog: Still no visible signs. Some dogs may show very mild lethargy or slight appetite changes, but most appear completely normal.

What you should do:

• Continue normal diet and routine
• Days 1–32 are the most critical period — avoid ALL unnecessary medications and supplements
• Keep your dog away from sick animals or potential sources of infection

Week 3 (Days 15–21): Embryos Implant & First Changes

What's happening inside: Embryos are now firmly implanted in the uterine wall. Each embryo is less than 1 cm in size. Organ systems begin the earliest stages of development.

Signs in your dog:

• Nipples may begin to enlarge slightly and take on a pinkish-red color (called "pinking up")
• Your dog may seem slightly hungrier than usual
• Some dogs show mild nausea (dog equivalent of morning sickness)

What you should do:

• Schedule a vet visit if you haven't already
• Around Day 21, an ultrasound can begin to detect developing embryos
• No need to increase food yet — overfeeding in early pregnancy increases birth complication risks

Week 4 (Days 22–28): Most Critical Development Period

What's happening inside: This is the most formative week of the entire pregnancy. The puppies' faces, spinal cords, and eyes begin to form. They are highly vulnerable to birth defects from toxins or medications at this stage.

Signs in your dog:

• Mammary glands (nipples/breasts) may begin to swell noticeably
• A clear vaginal discharge may appear — this is normal
• Your dog may show increased affection or, conversely, seek more solitude
• Mild vomiting or reduced appetite (morning sickness) possible

What you should do:

• Vet visit now: Around Day 25–28, your vet can perform abdominal palpation or an ultrasound to confirm pregnancy
• Begin to restrict rough play and high-impact exercise
• Discuss nutritional supplements with your vet — do NOT add supplements without guidance
• A relaxin hormone blood test can confirm pregnancy from Day 22–27

Week 5 (Days 29–35): Puppies Take Shape

What's happening inside: Fetuses begin to develop distinct dog features. Toes, claws, and whiskers start to form. Gender (sex) of each puppy develops this week. Each fetus is now about 2–3 cm long. The puppies are now much less vulnerable to developmental defects.

Signs in your dog:

• Abdomen begins to visibly enlarge (belly swelling becomes noticeable)
• Weight gain starts — usually 20–50% above pre-pregnancy weight by the end of pregnancy
• Increased appetite becomes apparent
• More frequent urination (growing uterus presses on bladder)

What you should do:

• This is an ideal week for an ultrasound scan — it can detect heartbeats and estimate number of puppies
• Begin gradually increasing food — transition toward a high-quality puppy food formula for extra calories and nutrients
• Feed smaller, more frequent meals if she shows discomfort eating large portions

Week 6 (Days 36–42): Rapid Growth Continues

What's happening inside: Fetuses grow rapidly, now reaching 4–5 cm in length. Skin pigmentation develops. Eyelids are formed but remain sealed. The puppies' skeletons begin to calcify.

Signs in your dog:

• Belly is now clearly enlarged and obviously visible
• Some dogs begin producing a milky pre-milk secretion from nipples
• Reduced appetite in some dogs — their stomachs are being crowded by the growing uterus
• More fatigue and preference for resting

What you should do:

• Feed 2–3 smaller meals per day instead of one large meal
• Increase daily calorie intake by about 25% above her normal maintenance level
• Switch fully to high-quality puppy food or a diet recommended by your vet
• Continue gentle exercise — short, calm walks only

Week 7 (Days 43–49): Bone Mineralization

What's happening inside: Puppies' skeletons are now mineralizing (hardening), which means they will show up on X-ray for the first time. Fetuses now exceed 6–7 cm in length. Coat color begins to develop.

Signs in your dog:

• Significant abdominal enlargement — you can often feel puppies moving when touching the belly
• Your dog may begin showing nesting behavior (rearranging bedding, seeking out quiet spots)
• Possible reduction in appetite as the uterus presses on the stomach
• Breast swelling and milk production increases

What you should do:

• Schedule an X-ray this week — this allows your vet to count puppies' skulls and spines, giving you an accurate litter count so you know when all puppies have been born
• Introduce the whelping box now so she can get comfortable with it
• Avoid strenuous exercise entirely; stick to very short, gentle walks
• Encourage eating with appetizing, soft food if appetite is reduced

Week 8 (Days 50–57): Final Preparation

What's happening inside: Puppies' skeletons are now fully formed. All organs are in place. Puppies are fully developed except for final lung maturation. They now have touch sensitivity — you can gently feel them moving inside the belly.

Signs in your dog:

• Intense nesting behavior — digging, rearranging, seeking enclosed spaces
• Colostrum (first milk, yellowish in color) may be visible from nipples
• Restlessness and anxious behavior
• Your dog may spend increasing time in the whelping box

What you should do:

• Whelping box should be fully set up in a warm, quiet, low-traffic area
• Give your dog a bath at the end of Week 8 — this is the last chance before birth
• Feed as much as she will eat — calorie needs are now 50% above normal
• Prepare your whelping kit: clean towels, heating pad, bulb syringe, gloves, iodine, scale, and your vet's emergency number
• Begin monitoring her rectal temperature twice daily (normal: 101–102.5°F / 38.3–39.2°C)

Week 9 (Days 58–65): Birth is Imminent

What's happening inside: Puppies are fully developed and ready to be born. They have turned in the birth canal in preparation for delivery. This is the final week of the pregnancy.

Signs in your dog:

• Rectal temperature drops below 99°F (37.2°C) approximately 24 hours before labor — this is your clearest sign that birth is near
• Loss of appetite within 24 hours of delivery
• Panting, pacing, restlessness
• Clear or slightly bloody vaginal discharge signals labor is beginning

What you should do:

• Take her temperature every 4–6 hours once you are past Day 58
• Have someone present at all times — do not leave her alone
• Keep your veterinarian's number on hand for emergency contact
• Once contractions begin, expect each puppy to arrive every 30–60 minutes
• If she strains for more than 30 minutes without producing a puppy, or rests for more than 4 hours between puppies, contact your vet immediately

Dog Pregnancy Week by Week – Summary Table

Dog Pregnancy Calendar

The dog pregnancy calendar below is your complete day-by-day reference guide, organized by trimester and week. Use this alongside the Dog Pregnancy Calculator to plan vet visits, dietary changes, and whelping preparation. Print it out and keep it on your fridge during your dog's pregnancy.

First Trimester Dog Pregnancy Calendar (Days 1–21)

Second Trimester Dog Pregnancy Calendar (Days 22–42)

Third Trimester Dog Pregnancy Calendar (Days 43–65)

Complete Dog Pregnancy Calendar – All 9 Weeks Overview

Signs of Dog Pregnancy – What to Look For

Not all dogs show obvious pregnancy signs early on. Some dogs look and act completely normal until Week 5 or 6. However, knowing these key signs will help you identify pregnancy sooner and get your dog the care she needs.

Early Signs of Dog Pregnancy (Weeks 1–4)

• Nipple changes ("pinking up"): Nipples enlarge, become more prominent, and take on a reddish-pink color. Most noticeable around the nipples closest to the hind legs.
• Mild appetite changes: Your dog may eat slightly less, refuse certain foods, or conversely seem hungrier than normal.
• Morning sickness: Some dogs vomit occasionally in early pregnancy (Weeks 3–5). This is caused by rising progesterone and gastrin hormones. Not all dogs experience this.
• Behavioral changes: Increased affection, clinginess, or withdrawal and desire for solitude. Some dogs become quieter and sleep more.
• Slight weight gain: Usually not noticeable until after Week 4–5.
• Clear vaginal discharge: A small amount of clear mucus discharge is normal in early pregnancy.

Later Signs of Dog Pregnancy (Weeks 5–9)

• Visible belly enlargement: The abdomen swells noticeably from Week 5 onward, becoming quite large by Weeks 7–8.
• Weight gain: Most pregnant dogs gain 20–50% above their pre-pregnancy weight by the final weeks.
• Breast swelling and milk production: Mammary glands enlarge significantly. Colostrum (yellow-tinted pre-milk) may drip from nipples in the final weeks.
• Nesting behavior: Your dog may start digging, rearranging bedding, and seeking out quiet, enclosed spaces. This intensifies in Weeks 7–9.
• Increased urination: The growing uterus presses on the bladder, increasing the frequency of urination.
• Puppy movement: From around Week 7 onward, you may be able to see or feel puppies moving when you gently touch your dog's belly.
• Coat changes: Some dogs develop a shinier, thicker coat in early pregnancy due to hormonal changes.

How to Confirm Dog Pregnancy – Veterinary Methods

False Pregnancy in Dogs (Pseudopregnancy)

A false pregnancy (also called pseudopregnancy or phantom pregnancy) is a condition where a dog shows all the classic signs of pregnancy — including belly swelling, milk production, nesting, and behavioral changes — without actually being pregnant. This occurs because of hormonal fluctuations (progesterone and prolactin levels rise and fall similarly during the luteal phase, whether or not a dog is pregnant).

Key signs that distinguish a false pregnancy:

• Symptoms appear 6–12 weeks after a heat cycle without mating
• Dog may "adopt" stuffed toys as puppies and guard them aggressively
• Milk production with no prior mating
• Ultrasound or blood test confirms no fetuses or relaxin present

False pregnancy typically resolves on its own within 2–3 weeks. Consult your vet if symptoms are severe, as treatment may help. The most reliable prevention is spaying your dog.

Pregnant Dog Nutrition – What to Feed and When

Proper nutrition is one of the most important things you can do for your pregnant dog and her developing puppies. Here is a stage-by-stage guide to feeding your pregnant dog:

Weeks 1–4: Maintain Normal Diet

During the first four weeks, continue your dog's regular high-quality adult dog food. Do not overfeed at this stage — excessive weight gain in early pregnancy is associated with increased risks of birthing complications. If your dog is already at a healthy weight, no changes are needed.

Weeks 5–6: Gradual Calorie Increase

From Week 5 onward, begin transitioning your dog to a high-quality puppy food formula. Puppy food has higher protein, calorie density, and essential nutrients (calcium, DHA) that support fetal growth. Increase her daily food by approximately 20–25% above her normal portion.

Weeks 7–9: High-Demand Feeding

In the final three weeks, your dog's calorie needs increase dramatically. By Week 9, she may need 50% more calories than her pre-pregnancy maintenance intake. Because the growing puppies compress her stomach, she can no longer eat large meals comfortably — switch to 3–4 small meals per day.

Foods to Avoid During Dog Pregnancy

• Raw meat and fish (risk of parasites and bacteria)
• Liver in large quantities (excess Vitamin A is toxic)
• Calcium supplements (unless prescribed by your vet — excess calcium can cause eclampsia)
• Grapes, raisins, onions, garlic, chocolate, xylitol, and macadamia nuts (toxic to dogs)
• High-fat, low-nutrient junk foods or table scraps

Nutritional Needs at a Glance

Signs of Labor in Dogs – What to Expect During Whelping

Pre-Labor Signs (24–48 Hours Before Birth)

• Temperature drop: Rectal temperature falls from normal (101–102.5°F / 38.3–39.2°C) to below 99°F (37.2°C). This is the single most reliable sign of impending labor — birth typically follows within 12–24 hours.
• Loss of appetite: Most dogs stop eating 12–24 hours before labor begins.
• Restlessness and panting: Increased pacing, inability to settle, and rapid breathing.
• Nesting intensifies dramatically: Digging, rearranging bedding, moving in and out of the whelping box.
• Clear or slightly bloody vaginal discharge signals that labor is beginning.

Active Labor – What to Expect

• Stage 1 (0–12 hours): Uterine contractions begin. Your dog will be restless and panting. The cervix dilates. This stage can last up to 12 hours and is often the longest.
• Stage 2 (Puppy delivery): Active pushing and straining. Each puppy is delivered inside its amniotic sac. The mother will tear the sac open, bite the umbilical cord, and lick the puppy vigorously to stimulate breathing.
• Stage 3 (Placenta delivery): Each puppy is followed (usually within 15 minutes) by its placenta. Count placentas to ensure all have been expelled — a retained placenta can cause life-threatening infection.
• Puppies typically arrive every 30–60 minutes. It's normal for the mother to rest between deliveries for up to 2 hours.

When to Call the Vet – Emergency Signs During Whelping

What to Prepare: Dog Whelping Box and Kit Checklist

Prepare your whelping area and kit at least 1–2 weeks before the due date. This gives your dog time to get comfortable in her whelping box before labor begins.

Whelping Box Requirements

• Large enough for your dog to stretch out fully and roll over comfortably
• Sides low enough for the mother to step in and out, but high enough to contain newborn puppies
• A "pig rail" (inner ledge) to prevent the mother from accidentally crushing a puppy against the side
• Lined with clean, washable towels or blankets that can be changed frequently
• Placed in a warm (75–80°F / 24–27°C), quiet, low-traffic area of your home

Whelping Kit Checklist

After the Birth – Newborn Puppy and Mother Care

The first 24–48 hours after birth are critical for both the mother and newborn puppies. Here is what to monitor:

• Ensure all puppies nurse within the first 2 hours: Colostrum (first milk) contains vital antibodies that protect newborns from infection. If a puppy cannot nurse, contact your vet immediately for guidance on supplemental feeding.
• Check puppy temperatures: Newborns cannot regulate their own body temperature. The whelping area should be kept at 75–80°F (24–27°C) for the first week.
• Weigh puppies daily: Puppies should gain weight every day. A puppy that loses weight after the first 24 hours is not getting enough nutrition — this is a veterinary emergency.
• Monitor the mother: Watch for signs of eclampsia (trembling, staggering, excessive panting) — this is a life-threatening drop in calcium caused by milk production.
• Vet check at 24–48 hours: Have your vet examine the entire litter and the mother within 48 hours of birth.
• Puppies' eyes open at 8–14 days old — this is completely normal development.

Frequently Asked Questions About Dog Pregnancy

How long is a dog pregnant?

Dogs are pregnant for an average of 63 days (9 weeks) from ovulation. The safe birth window ranges from Day 58 to Day 68 from the mating date. All breeds have the same average gestation period, though individual births may vary by a few days on either side.

How accurate is a dog pregnancy calculator?

A dog pregnancy calculator based on the mating date is a useful estimate but not 100% precise, because dogs can mate during several days of their heat cycle while ovulation occurs on a specific day. The most accurate due date comes from a progesterone test to pinpoint ovulation, combined with a Week 7 X-ray to prepare for the exact litter count. The calculator gives a reliable window of when to expect birth.

When can I confirm my dog is pregnant?

The earliest reliable confirmation is a relaxin blood test at Day 22–27 after mating. Ultrasound can confirm pregnancy from Day 21–28 onward and is the most informative method (checking heartbeats and fetal health). Abdominal palpation by a vet is possible at Day 25–35, though not always accurate.

Can a dog be pregnant for more than 63 days?

Yes. Dogs can deliver healthy puppies between Day 58 and Day 68 from mating. However, if your dog has not gone into labor by Day 65–68, contact your veterinarian — this could indicate a problem requiring intervention such as an oxytocin injection or C-section.

How many puppies will my dog have?

Litter size depends on breed, age, and the individual dog. Small breeds typically have 1–4 puppies; medium breeds 4–6; large breeds 6–8; and giant breeds can have 8–12 or more. The most accurate way to know exactly how many puppies to expect is an X-ray at Day 50–55, which counts individual skulls and spines.

Should I change my pregnant dog's diet?

Yes, but timing matters. Maintain her normal diet for the first four weeks. From Week 5, gradually transition to a high-quality puppy food formula which provides the extra protein, calories, and calcium needed for fetal development. By the final weeks, she may need up to 50% more calories than normal. Always consult your vet before adding supplements.

What is a false pregnancy in dogs?

A false pregnancy (pseudopregnancy) is when a dog shows all the signs of pregnancy — belly swelling, milk production, nesting — without actually being pregnant. It occurs due to natural post-heat hormonal changes. It typically resolves within 2–3 weeks. A vet visit and ultrasound will confirm whether the pregnancy is real or false.

Can I walk my pregnant dog?

Yes, gentle exercise is beneficial throughout most of the pregnancy. Short, calm walks help maintain muscle tone and prevent excessive weight gain. Avoid strenuous activities, jumping, rough play, and high-impact exercise, especially from Week 5 onward. In the final 1–2 weeks, keep exercise to a minimum and only allow gentle potty breaks.

When should I call the vet during labor?

Call your vet immediately if your dog strains for more than 30 minutes without producing a puppy, if there is a gap of more than 4 hours between puppies, if you see green or black discharge before the first puppy is born, or if the number of puppies born is fewer than your X-ray count. These are emergency situations.

A Note From Our Veterinary Team

This Dog Pregnancy Calculator guide is designed to help pet owners and breeders navigate the journey of canine pregnancy with confidence. While this resource provides comprehensive information based on established veterinary knowledge, it is not a substitute for professional veterinary care.

Every pregnant dog is different. Breed, age, litter size, and individual health all affect how pregnancy progresses. We strongly encourage you to work closely with a licensed veterinarian throughout your dog's pregnancy — from confirmation through whelping and into the newborn puppy period.

With the right knowledge and the right care, your dog's pregnancy can be a safe, healthy, and joyful experience for both her and your family.

Key Takeaways

• Average dog pregnancy = 63 days (range: 58–68 days) from mating
• Use our Dog Pregnancy Calculator: Mating Date + 63 Days = Estimated Due Date
• Confirm pregnancy via ultrasound at Day 21–28 or relaxin test at Day 22–27
• Get an X-ray at Day 50–55 to count puppies accurately
• Maintain normal diet for first 4 weeks, then switch to puppy food from Week 5
• Set up whelping box by Week 7 at the latest
• Monitor rectal temperature from Day 58 — a drop below 99°F signals labor within 24 hours
• Keep your vet's emergency number on hand throughout labor and delivery