Due date, timeline, whelping prep

Dog Pregnancy Calculator

When Will My Dog Give Birth?

Enter the mating date. Get the due date, the week-by-week timeline, and every vet visit you need to schedule - all in one place.

63-day gestation formula

Week-by-week milestones

Printable whelping calendar

My Dogs integration

Load the mother's saved profile or save the basics now for later follow-up.

Choose your calculation method

Mating date is the most common. LH peak and ovulation are tighter when veterinary testing is available.

Mating Date

Best when you know the breeding date but do not have LH or progesterone testing. Accuracy is usually broader because sperm can survive several days before fertilization.

Date of first matingDate of last mating (optional)

Dog's name (optional)Breed (optional)

Mother's age (years)

Pregnancy confirmation

Is this her first pregnancy?

The report includes due date, whelping window, weekly timeline, temperature tracking, and preparation steps.

Why this page is stronger

It turns a due date into a full whelping plan

The calculator does not stop at a single date. It gives the due window, current pregnancy stage, key veterinary checkpoints, and a practical final-week monitoring system.

Three timing methods

Switch between mating, LH peak, and ovulation-based due-date logic without leaving the page.

Week-by-week guidance

Every week is tied to fetal development, nutrition, vet actions, and the next preparation step.

Final-week monitoring

Temperature tracking and emergency timing rules help bridge the gap between due-date math and real labor management.

Quick accuracy guide

Mating date+63 days+/-3 to 5 days

LH peak+65 days+/-1 day

Ovulation+63 days+/-1 day

The science behind it

How to calculate a dog's due date

Canine gestation is usually described as 63 days from ovulation, but owners often only know the mating date. That matters because mating, ovulation, and fertilization are not the same time point. Sperm can survive for days, and eggs still need time to mature after ovulation.

That is why mating-date calculators are practical but wider, while LH peak and confirmed ovulation produce tighter due-date estimates. The calculator above lets owners use the strongest time point they actually have rather than forcing one single method on every breeding.

The whelping window should still be treated as a monitored range, not a guaranteed appointment. A due date is a planning anchor. Labor signs, temperature changes, and veterinary judgment still decide what matters most in the final days.

Pregnancy confirmation also changes by week. Ultrasound is most useful around days 25 to 28 for confirming heartbeats, while X-ray after day 45 is much better for counting puppies because skeletons have mineralized. Abdominal palpation belongs in experienced veterinary hands, not at-home checking. Early signs such as appetite changes, pinker nipples, mild morning sickness, or a larger abdomen are helpful clues, but they are not as reliable as a veterinary exam.

Age and breed matter too. Use the dog age calculator to sanity-check the mother's life stage, especially if she is very young or senior. Brachycephalic breeds such as Bulldogs, French Bulldogs, and Pugs should have a C-section conversation early because natural whelping can be riskier.

Method comparison

From mating date

Due date = mating date + 63 days

Accuracy: roughly +/-3 to 5 days

Best for: owners without reproductive testing

From LH peak

Due date = LH peak + 65 days

Accuracy: often +/-1 day

Best for: planned breedings with veterinary monitoring

From ovulation

Due date = ovulation + 63 days

Accuracy: often +/-1 day

Best for: highest practical accuracy with progesterone confirmation

Why mating date is less exact

Sperm can survive for several days inside the reproductive tract.
Ovulation may happen after the first observed breeding.
Eggs need additional time to mature before fertilization is possible.
Repeated breedings can widen the actual conception window.

Brachycephalic breeds such as Bulldogs and French Bulldogs deserve even more planning because elective or emergency C-sections are more common than in many other breeds.

Weekly care guide

Dog pregnancy week by week: complete care guide

These weekly cards map fetal development, maternal changes, nutrition, vet actions, and avoid-lists from day 1 through the whelping window.

Week 1

Week 1 (Days 1-7) - Fertilization

Fetal development

Sperm fertilizes eggs in the oviducts. Early embryos are microscopic and begin traveling toward the uterus while cell division starts.

Mother's symptoms

Usually no visible signs at all.
Behavior and appetite are commonly unchanged.
Some dogs may seem a little more affectionate.

Nutrition

Continue the normal adult maintenance diet.
No calorie increase is needed yet.
Keep water intake steady and stress low.

Vet actions and avoid

Review mating timing if you are tracking a planned breeding.
Confirm that any routine medications are pregnancy-safe.
X-rays and non-essential medications.
Live vaccines and unnecessary chemical exposure.
Heavy physical stress or rough travel if avoidable.

Week 2

Week 2 (Days 8-14) - Implantation

Fetal development

Embryos implant around days 10 to 12 and start forming placental connections. Cell layers begin differentiating into future organ systems.

Mother's symptoms

Still often subtle or absent.
Mild nausea or slight appetite dips can appear.
Very early nipple enlargement is possible.

Nutrition

Keep calories near maintenance.
Offer smaller meals if nausea shows up.
High-quality protein remains the priority.

Vet actions and avoid

No routine visit is required yet unless the dog seems unwell.
Monitor for repeated vomiting rather than isolated nausea.
Trying to palpate the abdomen yourself.
Medication changes without veterinary approval.

Week 3

Week 3 (Days 15-21) - Organogenesis

Fetal development

The heart, brain, spinal structures, and other major organs begin to form. This is the most sensitive period for toxin exposure.

Mother's symptoms

Appetite may begin returning or increase slightly.
Nipples can look a little larger or pinker.
Some dogs become clingier or more protective.

Nutrition

Start planning a gradual transition to a high-quality puppy formula.
Do not overfeed yet, but quality matters more.
DHA-rich food or fish-oil discussion may be appropriate with your vet.

Vet actions and avoid

Experienced veterinarians may discuss palpation in the coming week.
This is a good time to schedule a day 25-35 ultrasound window.
Any non-essential medications or pesticide exposure.
Harsh chemical cleaners, flea products, or supplements not cleared by your veterinarian.

Week 4

Week 4 (Days 22-28) - First Ultrasound Window

Fetal development

Heartbeats become visible on ultrasound from around day 25. Eyes, facial structures, and the spinal column continue to differentiate.

Mother's symptoms

Pink, enlarged nipples are more obvious.
The abdomen may start to feel slightly firmer.
Clear, odorless discharge can be normal.

Nutrition

Increase calories modestly, roughly 10% above maintenance if appetite rises.
Transition fully to puppy food if your vet agrees.
Split food into 2 to 3 meals if needed.

Vet actions and avoid

Schedule or complete the first ultrasound between days 25 and 35.
Discuss the overall whelping plan and emergency contact flow.
Rough play, repeated jumping, or intense conditioning work.

Week 5

Week 5 (Days 29-35) - Rapid Growth

Fetal development

Fetuses become more recognizably puppy-shaped. Toes, whisker pads, and sex differentiation are underway, and body growth accelerates.

Mother's symptoms

The abdomen becomes more obviously enlarged.
Appetite usually increases markedly.
The dog may tire more quickly on longer activity.

Nutrition

Increase calories to roughly 25% to 30% above maintenance.
Feed 3 smaller meals if the abdomen is starting to crowd the stomach.
Keep the food highly digestible.

Vet actions and avoid

Talk through C-section planning if the breed or history raises that risk.
Use ultrasound for pregnancy confirmation if it has not already been done.
Hard conditioning, long hot walks, or major routine upheaval.

Week 6

Week 6 (Days 36-42) - Skeleton and Pigmentation

Fetal development

Skeletal calcification begins and pigmentation patterns develop. The fetuses look increasingly like full puppies and continue gaining size quickly.

Mother's symptoms

The abdomen is now obviously large.
Some mothers begin showing early nesting behavior.
Colostrum can appear in the mammary glands.

Nutrition

Calories may rise toward 50% above maintenance.
Feed 3 to 4 smaller meals instead of one large portion.
Hydration demand is increasing.

Vet actions and avoid

Schedule the X-ray window for days 45 to 55.
Set up the whelping box this week so the mother can get used to it.
Large meals, strenuous exercise, or crowded noisy environments.

Week 7

Week 7 (Days 43-49) - Pre-Birth Preparation

Fetal development

Puppies are fully formed and now focused on growth and lung maturity. Many start shifting into better birth position.

Mother's symptoms

Strong nesting behavior is common.
Appetite can start to dip as abdominal crowding increases.
Panting and restlessness may appear more often.

Nutrition

Maintain calorie density but keep portions small and frequent.
Fresh water should be available at all times.
Do not force large meals if appetite fluctuates.

Vet actions and avoid

Complete a final preparation review with your regular veterinarian.
Have the emergency clinic number saved and visible.
Last-minute scrambling for equipment or emergency logistics.

Week 8

Week 8 (Days 50-56) - Start Temperature Monitoring

Fetal development

Puppies are near full maturity and continue positioning for birth. Lung development reaches the final stretch.

Mother's symptoms

Restlessness and digging can become obvious.
The abdomen may appear to drop as puppies descend.
Appetite may stop entirely 24 to 48 hours before labor.

Nutrition

Offer food but expect some mothers to eat less.
Keep water intake easy and frequent.
Have puppy milk replacer ready as a backup only.

Vet actions and avoid

Start rectal temperatures twice daily from day 56 onward.
Review emergency warning signs with everyone in the household.
Leaving the mother unmonitored for long stretches.
Skipping temperature logs in the final days.

Week 9

Week 9 (Days 57-65) - Whelping Week

Fetal development

Puppies are fully mature and ready for delivery. Whelping most often happens between days 61 and 65, depending on the true ovulation date.

Mother's symptoms

A temperature drop below 100 F often comes 12 to 24 hours before labor.
Stage 1 labor includes nesting, panting, pacing, and restlessness.
Visible contractions and straining signal active delivery.

Nutrition

Offer food, but do not worry if appetite disappears right before labor.
Focus more on hydration and close monitoring than calorie targets.

Vet actions and avoid

Call your veterinarian if strong straining lasts more than 30 minutes without a puppy.
Call if more than 4 hours passes between puppies or if labor exceeds 24 total hours.
Assuming every delay is normal when the dog is exhausted or unproductive.
Missing placenta counts or ignoring abnormal discharge.

Pregnancy nutrition

Feeding a pregnant dog by trimester

A pregnant dog does not need a large food increase during the first month. The major nutrition shift happens in the second half of pregnancy, when fetal growth accelerates and the mother has less stomach space. That is why many vets move the mother gradually onto a high-quality puppy or reproduction diet around week 5.

Puppy food is usually more energy-dense than adult maintenance food, so the mother can eat smaller meals without falling behind on calories. In the final weeks, split food into several smaller meals and keep water easy to reach. Do not add calcium tablets casually; inappropriate calcium supplementation can increase the risk of calcium problems after birth.

For a practical feeding estimate, use the Dog Food Calculator and monitor the mother's weight trend with the Dog Weight Calculator.

Nutrition quick table

Use this as a planning reference, then follow your veterinarian's exact advice.

Stage	Food increase	Food type	Focus
Week 1-4	Normal intake	High-quality adult food	Folate, DHA discussion, no random medication
Week 5-6	+25-30%	Puppy food or high-energy adult food	Protein, digestibility, gradual transition
Week 7-9	+50-75%	Puppy food, small frequent meals	Energy density, calcium-phosphorus balance
Lactation	+100-200%+	High-calorie puppy food	Calories, water, calcium demand, DHA

Whelping box setup

Whelping box setup guide

Prepare the physical setup and emergency contact chain by week 7, not when labor starts. The box should feel familiar before the first contraction.

Box dimensions

1.5x body length by 1.5x body length

The mother should be able to turn, stretch, nurse, and leave easily, while the puppies stay contained. Pig rails help reduce crush risk along the walls.

Set the whelping box up at least one week before the due window so the mother can choose it before labor.
Use easy-clean materials such as plastic or sealed wood, and line the base with washable layers you can replace quickly.
Keep the room quiet, dry, and warm. Newborn puppies need warmth, but the mother also needs an area that is not overheated.
Place a low heat source under only one side so puppies can crawl away if they become too warm.
Put the emergency clinic number, puppy scale, thermometer, towels, bulb syringe, and birth log within reach before week 9.

Whelping box

□Box about 1.5x the mother's body length in both directions
□Low entrance for the mother, high enough sides to contain puppies
□Pig rails or anti-crush design along the inside walls
□Waterproof liners and clean absorbent pads
□Washable towels and blankets
□A safe heat source for one side only

Monitoring equipment

□Digital rectal thermometer
□Kitchen or puppy scale in grams
□Notebook or printed birth log
□Phone charger and emergency numbers visible nearby

Medical supplies

□Sterile gloves
□Bulb syringe
□Sterile scissors
□Dental floss or umbilical clamps
□Iodine for cord care
□Puppy milk replacer and feeding backup

Emergency contacts

□Regular veterinarian phone number
□24-hour emergency clinic
□Experienced breeder or mentor backup contact

Signs of labor

Signs of labor in dogs - what to watch for

The temperature drop is the strongest late-stage clue, but behavior and physical changes still help owners recognize the transition into labor.

Temperature drop

Normal is usually around 101 to 102.5 F.
A drop below 100 F often means labor within 12 to 24 hours.
Start twice-daily temperatures from day 56.

Behavioral signs

Intense nesting, digging, or rearranging bedding
Refusing food
Restlessness, panting, pacing, shivering, or seeking solitude

Physical signs

Clear discharge or mucus
Visible abdominal contractions
Straining and the appearance of a fluid sac

Emergency signs

Emergency warning signs - call your vet immediately

Some problems are not “wait and see” situations. These are the big red flags during pregnancy, labor, and the first postpartum days.

During pregnancy

Bright red or heavy vaginal bleeding
Foul-smelling discharge
Collapse, seizures, or extreme lethargy
Repeated vomiting or obvious distress

During labor

Strong contractions for more than 30 minutes with no puppy
More than 4 hours between puppies
A puppy clearly stuck in the birth canal
Green discharge before the first puppy
Mother becoming unresponsive or severely exhausted

After birth

Mother ignoring every puppy
Continued heavy bleeding
Fever after the first day
Painful hot mammary glands suggesting mastitis

Newborn puppy care

Newborn puppy care - first 24 hours

Immediately after birth, the priorities are airway clearance, warmth, nursing, and simple record-keeping. If the mother does not tear membranes or stimulate the puppy, step in calmly with a warm towel and clear the face first.

Each puppy should nurse within the first couple of hours if possible so colostrum transfer is not missed. Birth weight should be recorded for every puppy because the trend over the next few days often tells the real story faster than appearance alone.

Newborns cannot regulate body temperature well. Keep the environment warm and give them space to move away from the heat source rather than heating the entire box to a dangerous level.

Normal vs concerning in newborns

Sign	Normal	Concerning
Color	Pink gums and tongue	Blue, white, or gray tone
Behavior	Nursing and sleeping	Constant crying or no suckle
Weight	Daily gain after birth	Weight loss beyond day 1
Temperature	Warm to touch	Cold, weak, or limp
Breathing	Quiet and regular	Labored, open-mouth, or gasping

FAQ

Dog pregnancy calculator - frequently asked questions

These questions cover the most common follow-up searches around dog due dates, whelping windows, pregnancy confirmation, feeding, temperature drops, and labor timing.

How long are dogs pregnant?

Dogs are pregnant for about 63 days when the count starts from confirmed ovulation. Owners often only know the mating date, and that is why a mating-based dog pregnancy calculator should show a wider range. Sperm can survive inside the female reproductive tract for several days, and eggs remain viable for a shorter window after ovulation, so the actual fertilization date may not match the day you saw breeding. From a mating date, a practical planning range is usually about 58 to 68 days, with day 63 used as the midpoint estimate. If your dog reaches 70 days from mating with no labor signs, contact your veterinarian rather than waiting.

How do I calculate my dog's due date?

Use the strongest timing point you have. If your veterinarian identified ovulation with progesterone testing, add 63 days to that date. If you know the LH peak date, add 65 days. If you only know the mating date, use mating date plus 63 days as the central estimate and keep the broader 58 to 68 day whelping range on your calendar. For multiple matings, this calculator uses the last mating date for the due-date range because the final breeding may be closest to the true fertilization window. Treat the result as a planning tool, not a replacement for late-pregnancy veterinary checks.

How early can you tell if a dog is pregnant?

Pregnancy confirmation usually becomes realistic in the fourth week. Relaxin blood testing may be discussed around days 22 to 27, depending on the clinic and case. Ultrasound is commonly useful around days 25 to 28 because fetal heartbeats can be visible, but early ultrasound is not the best way to count puppies accurately. An experienced veterinarian may be able to palpate the abdomen around days 28 to 35, but owners should not try this at home because rough handling can be harmful. X-ray becomes useful after about day 45, when fetal skeletons mineralize and puppy counting becomes much more reliable.

How many puppies will my dog have?

Litter size depends on breed, body size, age, fertility, breeding timing, and whether this is a first litter. Toy and small dogs often carry fewer puppies, while large and giant breeds can carry much larger litters. The calculator can only provide a broad breed-size estimate. The most useful real count usually comes from an X-ray after day 45, when puppy skeletons are visible. Counting matters because it helps you know whether labor is complete. If you expected six puppies and only four are born, that changes the monitoring plan and may prevent a retained puppy from being missed.

What should I feed a pregnant dog?

Most dogs stay close to normal adult maintenance intake during weeks 1 to 4. The calorie increase becomes more important from week 5 onward, when fetal growth accelerates. Many dogs move to a high-quality puppy or reproduction food in the second half of pregnancy because it is more energy-dense and supports nursing after birth. Weeks 5 to 6 may need roughly 25 to 30 percent more food, while weeks 7 to 9 may need 50 to 75 percent more, often split into smaller meals because the enlarged uterus presses on the stomach. Do not add calcium supplements unless your veterinarian specifically recommends them.

When should I take my pregnant dog to the vet?

A practical pregnancy plan usually includes at least three checkpoints. First, schedule pregnancy confirmation around days 25 to 35, commonly with ultrasound. Second, plan an X-ray after day 45 to count puppies once skeletons are visible. Third, review the whelping plan during the final week, especially if this is a first litter, an older mother, a very young mother, or a breed with higher C-section risk. Call sooner for abnormal discharge, collapse, repeated vomiting, seizures, severe pain, strong contractions without a puppy, or long gaps between puppies during active labor.

What is the temperature drop before labor?

A normal canine rectal temperature is commonly around 101 to 102.5 F, or 38.3 to 39.2 C. In many dogs, progesterone drops before labor and rectal temperature falls below 100 F, or about 37.8 C. Labor often begins within 12 to 24 hours after that drop. The signal is most useful when you have been taking temperatures consistently twice daily from about day 56, because you can see the pattern rather than reacting to one random reading. A temperature drop does not replace observation: nesting, panting, restlessness, appetite loss, discharge, and contractions still matter.

How long does dog labor last?

Stage 1 labor may last 6 to 12 hours and often looks like restlessness, nesting, panting, trembling, and refusing food, but no puppy is visible yet. Active delivery begins when abdominal contractions and straining become obvious. The first puppy is commonly born within 1 to 4 hours after active contractions begin. Puppies may arrive 30 to 60 minutes apart, but some mothers rest longer between puppies. Call your veterinarian if there are strong contractions for more than 30 minutes with no puppy, more than 4 hours between puppies with obvious straining, a stuck puppy, or a mother who is exhausted or unresponsive.

Can I use this calculator after an accidental mating?

Yes. The mating-date method is often the only option after an accidental mating. Enter the date you know, and if there were multiple possible mating dates, use the range fields so the calendar reflects that uncertainty. The result should be treated as a planning estimate, not proof that the dog is pregnant and not a precise birth appointment. Schedule veterinary confirmation rather than waiting until the final week. If the mother is under one year old, over six years old, medically fragile, or a brachycephalic breed such as a Bulldog, French Bulldog, or Pug, the accidental mating needs especially early veterinary guidance.

Can a dog be pregnant for more than 65 days?

Yes, especially when you are counting from mating date. A dog may normally deliver later than day 65 from mating because the actual ovulation and fertilization dates may have occurred after the observed breeding. That is why mating-based calculators should show a broad 58 to 68 day range. If ovulation was confirmed, the window is tighter, and going far beyond the expected date deserves closer veterinary input. More than 70 days from mating with no labor signs should be treated as a veterinary evaluation point. Do not try to induce labor at home.

Next steps

What to do after you know the due window

Pregnancy planning gets more useful when it connects to feeding, weight, and the puppy-care stages that come next. If breeding has not happened yet, use the Dog Heat Cycle Calculator to plan heat cycle before pregnancy and identify the fertile window.

Dog Heat Cycle Calculator

Predict the next heat date, fertile window, pregnancy-prevention danger period, and four-stage cycle timeline.

Dog Food Calculator

Estimate daily calories, cups, grams, and meal timing using RER/MER math, food type, and brand calorie density.

Puppy Growth Calculator

Forecast adult size, monthly milestones, and growth-curve trends for puppies and young dogs.

Dog Weight Calculator

Compare your dog to healthy breed ranges, body condition scoring, and realistic goal-weight timelines.

Dog Size Calculator

Predict toy, small, medium, large, or giant adult size from breed, age, weight, and mixed-breed clues.

References

References and source material

These references support the gestation-timing framework, pregnancy diagnosis milestones, whelping preparation guidance, and neonatal care overview used on this page.

Concannon PW. Canine pregnancy: predicting parturition and timing events of the periparturient period.
Eilts BE. Pregnancy diagnosis in the bitch. Theriogenology.
Feldman EC, Nelson RW. Canine and Feline Endocrinology and Reproduction.
BSAVA Manual of Canine and Feline Reproduction and Neonatology.
Society for Theriogenology reproductive medicine resources.
WSAVA Global Reproduction and Neonatal Care guidance resources.