Dog Whelping Watch Calculator

Active Whelping Watch Is Critical

The final days of pregnancy and the whelping itself are the most high-stakes period of canine reproduction. Getting it wrong can result in fetal death, maternal complications, and uterine rupture.

This calculator helps you:

• Identify pregnancy phase (pre-whelping → imminent → active → post-due)
• Interpret temperature drops (predicts whelping within 12-24 hours)
• Track labor stages (1, 2, 3)
• Recognize DYSTOCIA red flags requiring urgent vet care
• Plan brachycephalic C-section timing

Canine Gestation Timeline

Gestation length: 63 ± 1 days from LH surge (most precise anchor) or 58-68 days from mating (mating fertile window 4-7 days = wider range).

Most Precise Method – LH Surge Anchored

Progesterone testing identifies the LH surge:

• Ovulation ~2 days after LH surge (progesterone ~4-10 ng/mL)
• Oocyte maturation completes 2-3 days post-ovulation
• Whelping ~63 days from LH surge with 1-day variation

Less Precise – Mating Date

58-68 days acceptable range — wide because the fertile window during the heat cycle spans 4-7 days.

Phase Identification

Day 1-54: Pregnancy In Progress

Normal pregnancy care:

• Standard adult diet through day 35-42 (pregnancy doesn’t increase energy needs until last 3 weeks)
• Switch to puppy/lactation food at day 35-42 (final 3 weeks)
• Restrict exercise in final 2 weeks
• Ultrasound at day 25-30 confirms pregnancy + assesses fetal viability
• X-ray at day 55+ counts puppies (skeleton mineralized)

Days 55-58: Late Pregnancy Preparation

• Set up whelping box if not already
• Begin temperature monitoring twice daily
• Decrease exercise
• Quiet environment
• Alert vet to expected whelping window

Days 59-63: IMMINENT WHELPING WATCH

TWICE-DAILY TEMPERATURE MONITORING CRITICAL:

• Drop of 1°C (1.8°F) below normal predicts whelping within 12-24 hours
• Stay close to dam
• Have whelping supplies ready
• Sleep nearby

Days 64-68: Active Whelping Window

Most dams whelp days 63-65 from LH surge.

If dam exceeds 68 days from LH (or 68 from last mating in 5-7 day breeding) without signs of imminent whelping, vet consultation for possible C-section.

Day 69+: POST-TERM

Same-day vet contact — risk of fetal death if pregnancy prolonged. May need induction or C-section.

Temperature Monitoring – The Reliable Predictor

Take rectal temperature twice daily from day 55.

Temperature	Interpretation
38.0-39.2°C (100.4-102.5°F)	Normal — no temperature drop
<38.0°C (<100.4°F)	Slight cooling — approaching whelping
<37.5°C (<99.5°F)	TEMPERATURE DROP — whelping likely within 12-24 hours
>39.2°C (>102.5°F)	FEVER — infection concern, vet contact

Some bitches show only modest drop — trend matters more than absolute value. Each dam has her own baseline.

Progesterone Decline

Whelping signaled by progesterone falling below 2 ng/mL approximately 24-48 hours before delivery.

Vet-Measured Progesterone Interpretation

Progesterone (ng/mL)	Status
<2	Whelping imminent (within 24-48 hours)
2-5	Declining — approaching whelping
5-15	Mid-late pregnancy
>15	Pregnancy maintained — not yet imminent

Quantitative progesterone testing (in-house Idexx machines or commercial labs) more accurate than semi-quantitative kits.

Multiple measurements over 24-48 hours plot the decline.

The Three Stages Of Labor

Stage 1: Cervical Dilation + Early Contractions

Duration: 6-12 hours (up to 24 hours in primiparous bitches)

Signs:

• Restlessness, panting
• Refusing food
• Nesting (digging, rearranging bedding)
• May shiver or vomit
• Hides from family
• Uterine contractions not visible externally

Owner action:

• Stay close
• Reassure dam
• Quiet environment
• No food offered
• Water available

Red flag: Stage 1 >24 hours without progression to Stage 2 = vet contact.

Stage 2: Active Expulsion Of Puppies

Signs:

• Visible abdominal contractions
• Dam pushing actively
• Water sac may appear at vulva
• Vocalisation sometimes

Timeline:

• First puppy within 1-2 hours of strong contractions
• Subsequent puppies 30 minutes to 2 hours apart
• Some dams rest 30-60 minutes between puppies (normal)
• Total duration varies 2-12 hours depending on litter size

Owner action:

• Observe each delivery
• Ensure dam clears airways (or do it yourself if she doesn’t)
• Weigh each puppy and record
• Mark identification (colored yarn collars loose around neck)
• Time between puppies monitored

Stage 3: Placenta Delivery

Placenta after each puppy (or shortly after).

Count placentas = puppies to monitor for retention.

Retained placenta:

• Causes metritis (uterine infection)
• Fever, foul discharge, anorexia, lethargy
• Vet contact same-day

DYSTOCIA Red Flags – Urgent Vet Care

Indications For Urgent Vet (Possible C-Section)

1. Strong contractions >30-60 minutes without producing a puppy
2. Weak/intermittent contractions >2-4 hours without progress
3. >2 hours between puppies with active contractions
4. >4 hours between puppies even without active contractions (if litter incomplete)
5. GREEN/BLACK discharge before first puppy delivered (placental separation = fetal hypoxia)
6. Excessive bloody discharge
7. Dam exhausted, weak, distressed
8. Stillborn puppy followed by no progress
9. Dam pushing with puppy visible at vulva >15 minutes (stuck puppy)
10. Anorexia or refusing water during labor

Green/Black Discharge BEFORE First Puppy

EMERGENCY — indicates placental separation without delivery. Fetal hypoxia developing. C-section needed immediately.

(Green discharge AFTER puppies have been born is normal — color from placental fluid.)

Dystocia Causes

• Uterine inertia — primary (weak contractions from start) or secondary (fatigue after some puppies)
• Fetal malposition — breach, transverse, oversized
• Fetal oversize — relative to maternal pelvis (brachycephalic risk)
• Maternal pelvic abnormality — congenital or post-trauma
• Dead fetus obstructing canal
• Multiple puppies wedged in birth canal

Brachycephalic C-Section Planning

60-90% C-section rate in brachycephalic breeds due to large fetal heads vs narrow maternal pelvis:

Highest-risk breeds:

• English Bulldog (often 100% in modern lines)
• French Bulldog
• Pug
• Boston Terrier
• Pekingese

Elective C-Section Timing

Plan from early pregnancy with reproductive veterinarian.

Typical scheduling:

• Progesterone <5 ng/mL (within 24-48 hours of natural whelping)
• Day 63 from LH surge (most precise)
• Avoid earlier C-section — fetal lung immaturity → neonatal mortality

Maternal Anaesthesia Considerations

• Airway management critical (brachy intubation challenging)
• Avoid prolonged anaesthesia
• Support team for puppy resuscitation
• Pre-oxygenation
• Specialized reproductive vet ideal

Whelping Box Setup

Set up 1-2 weeks before due date:

• Clean, washable surfaces
• Warm environment — room 24°C/75°F, box first week 28°C/82°F
• Draught-free
• Dam can stand and turn easily
• Rails (railings) to prevent dam crushing puppies against wall
• Easy owner access for monitoring
• Privacy — calm environment
• Bedding — newspaper layers initially (easy to change)

Whelping Supplies Checklist

Have ready 2 weeks before due date:

Item	Purpose
Clean towels	Drying puppies, clearing fluid
Dental floss or umbilical clamps	Tying off cords if needed
Iodine 2%	Navel disinfection
Surgical scissors	Cord cutting if dam doesn’t
Bulb syringe	Clearing puppy airways
Kitchen scale (gram precision)	Daily weighing
Heating pad / lamp	Puppy warming
Thermometer	Dam temperature monitoring
Yarn / collars	Puppy identification
Notebook	Recording times, weights, observations
Emergency vet contact	Pre-confirmed availability
Transport plan	If C-section needed
Esbilac milk replacer	Supplemental feeding ready
Puppy bottle + nipples	Bottle feeding

Each Puppy’s First Hour

1. Clear airways — dam usually licks face/snout

• If not, gently clear with bulb syringe or wipe with clean cloth

1. Stimulate breathing — vigorous rubbing with towel

• If not breathing, swing puppy gently head-down to clear fluid

1. Umbilical cord — dam usually severs

• If not, tie off with floss 2 cm from puppy and cut beyond knot
• Iodine 2% on stump

1. Warm — puppy cannot regulate temperature

• Heating pad or warming light
• 28°C/82°F environment

1. Nurse — encourage suckling within 30 min

• Critical for colostrum (passive immunity)

1. Weigh — record birth weight
2. Mark identification — loose yarn collar

Post-Whelping Care

Dam

• Free feed puppy/lactation diet (energy needs quadruple)
• Continuous water access
• Quiet recovery space
• Eclampsia watch 1-3 weeks post-whelp in toy breeds
• Mammary gland check daily for mastitis (hot, hard, painful)
• Lochia (post-whelping discharge) red-brown for up to 6 weeks normal
• Bright red or foul discharge after 2 weeks = vet

Puppies

• Weigh daily with gram-precision scale
• 5-10% body weight gain per day target first week
• Maintain temperature (32-34°C/90-93°F environment first week)
• Stimulate elimination if dam doesn’t (warm wet cloth on perineum)
• Watch for fading puppy syndrome

See PuppaDogs Lactating Dam + Nursing Puppy Calorie Calculator.

Eclampsia Watch (Post-Whelping)

Most common in toy/small breed lactating bitches 1-3 weeks post-whelping.

Signs:

• Muscle tremors
• Restlessness
• Fever
• Panting
• Ataxia
• Seizures
• Collapse

Emergency: Calcium gluconate IV at vet immediately — life-threatening.

Prevention: Calcium supplementation POST-whelping ONLY (NOT pre-whelping which increases risk).

When To Have Reproductive Vet On Call

Especially important for:

• First-time bitches (primiparous)
• Brachycephalic breeds
• Large or small litters predicted
• History of dystocia
• Pre-existing health conditions
• Toy breeds (eclampsia risk)
• Older dams (>6 years)

Honest Caveats

• Every whelping is unique — guidelines are not absolute
• Experience matters — work with reproductive vet, especially first time
• Don’t assume normal — when in doubt, vet contact
• Emergency C-section is faster than waiting too long
• Some dams need help with first puppy then proceed normally
• Have backup plan for transport if home whelping fails

Conclusion

Active whelping watch in the final week of pregnancy is critical for healthy outcomes. Twice-daily temperature monitoring from day 55 is the most reliable home prediction — drop of 1°C below normal predicts whelping within 12-24 hours. Progesterone <2 ng/mL signals whelping within 24-48 hours (key for elective C-section timing in brachycephalic breeds — typically scheduled at <5 ng/mL). Three stages of labor — Stage 1 (cervical dilation 6-12h), Stage 2 (active expulsion, first puppy within 1-2h of strong contractions, then 30min-2h between), Stage 3 (placentas). DYSTOCIA RED FLAGS requiring urgent vet care: strong contractions >30-60 min without delivering puppy, >2h between puppies with contractions, >4h between without, green/black discharge before first puppy. Brachycephalic breeds (Bulldog, French Bulldog, Pug) have 60-90% C-section rates — plan elective C-section from early pregnancy. Whelping supplies prepared 2 weeks before due date. Reproductive vet on call especially for first-time dams, brachys, large/small litters, and toy breeds.

Frequently Asked Questions

How long is dog pregnancy?

CANINE GESTATION is 63 ± 1 days FROM LH SURGE (most precise anchor); 58-68 days from MATING (mating fertile window spans 4-7 days = wider range). Vet-measured PROGESTERONE TESTING identifies the LH surge – ovulation occurs about 2 days after LH surge when progesterone reaches 4-10 ng/mL; oocyte maturation completes 2-3 days post-ovulation; whelping approximately 63 days after LH surge with 1-day variation. CLINICAL ANCHORS – day 25-30 ULTRASOUND confirms pregnancy; day 35-42 SWITCH TO PUPPY/LACTATION DIET (energy needs increase final 3 weeks); day 55+ X-RAY counts puppies; day 55-58 prep whelping box; day 59-63 IMMINENT WATCH twice-daily temperature monitoring; day 63-65 most dams whelp; over 68 days POST-DUE vet contact for C-section consideration.

When will my dog go into labor?

TEMPERATURE DROP is the most reliable home prediction. Take RECTAL TEMPERATURE TWICE DAILY from day 55. NORMAL canine temperature 38.0-39.2°C / 100.4-102.5°F. TEMPERATURE DROP of about 1°C (1.8°F) below the dam’s normal predicts WHELPING WITHIN 12-24 HOURS. Some bitches show only modest drop – trend matters more than absolute value. PROGESTERONE TESTING (vet-measured) more precise – progesterone falling BELOW 2 ng/mL signals whelping within 24-48 HOURS. PRE-WHELPING SIGNS (less reliable but observable): NESTING behavior (digging, rearranging bedding), RESTLESSNESS / pacing, REFUSING FOOD, PANTING, looking at flank/abdomen, occasional vomiting, shivering, milk in mammary glands. STAGE 1 LABOR follows lasting 6-12 hours (up to 24 hours in primiparous).

What is dystocia in dogs?

DYSTOCIA = difficult/prolonged labor requiring veterinary intervention. RED FLAGS requiring URGENT VET / possible C-section: (1) STRONG CONTRACTIONS for over 30-60 minutes WITHOUT producing puppy; (2) WEAK/INTERMITTENT contractions for over 2-4 hours without progress; (3) OVER 2 HOURS between puppies with active contractions; (4) OVER 4 HOURS between puppies even without active contractions if litter incomplete; (5) GREEN/BLACK DISCHARGE BEFORE first puppy (placental separation = fetal hypoxia EMERGENCY); (6) EXCESSIVE BLOODY DISCHARGE; (7) DAM EXHAUSTED, weak, distressed; (8) STILLBORN puppy followed by no progress; (9) DAM PUSHING with puppy visible at vulva over 15 minutes. CAUSES – uterine inertia (primary or secondary), fetal malposition, fetal oversize relative to pelvis (brachy classic), maternal pelvic abnormality, dead fetus obstruction.

How many puppies will my dog have?

LITTER SIZE VARIES by breed and individual. AVERAGE litter sizes (rough guide): TOY BREEDS 3-4 puppies; SMALL BREEDS 4-5; MEDIUM BREEDS 5-7; LARGE BREEDS 6-8; GIANT BREEDS 8-12. Some individual variation; first litter often smaller than subsequent. DEFINITIVE COUNT only from X-RAY at day 55+ when puppy skeletons are mineralized (ultrasound earlier can identify pregnancy but accurate counting needs X-ray). KNOWING LITTER SIZE essential for: (1) monitoring during labor (when are all puppies out?); (2) recognizing dystocia (if labor stops before count met); (3) post-whelping placenta count (retained placenta risk); (4) preparing supplies and supplemental feeding capacity for orphans. ULTRASOUND CAN COUNT roughly but X-ray more accurate.

Do all bulldogs need C-sections?

MOST modern English Bulldog/French Bulldog/Pug pregnancies require C-section. C-SECTION RATES: ENGLISH BULLDOG 80-100% (essentially universal in show lines); FRENCH BULLDOG 75-90%; PUG 60-80%; BOSTON TERRIER and PEKINGESE 60-70%. REASON: LARGE FETAL HEAD relative to NARROW MATERNAL PELVIS – vaginal delivery often impossible without trauma. ELECTIVE C-SECTION PLANNING: from early pregnancy with reproductive vet; PROGESTERONE TIMING critical – typically scheduled when progesterone drops BELOW 5 ng/mL (within 24-48 hours of natural whelping) or DAY 63 FROM LH SURGE; AVOID EARLIER C-SECTION – fetal lung immaturity = neonatal mortality; specialized REPRODUCTIVE VET ideal; AIRWAY management critical (brachy maternal intubation challenging); SUPPORT TEAM for puppy resuscitation. Free-whelp success rare in modern English Bulldog lines.

What is fading puppy syndrome?

CRITICAL NEONATAL EMERGENCY – puppy ‘fades’ in first few weeks of life. SIGNS: failure to nurse vigorously; cold to touch; limp/weak; crying constantly or unusually quiet; poor or no weight gain (normal is 5-10%/day first week); smaller than littermates by 25%+. CAUSES: HYPOTHERMIA (puppies cannot thermoregulate first 2-3 weeks); HYPOGLYCAEMIA (rapid blood sugar decline in tiny puppies); DEHYDRATION; SEPSIS (neonatal infection); CONGENITAL DEFECTS (heart, palate, etc.); FAILURE OF PASSIVE TRANSFER of maternal antibodies (didn’t nurse colostrum first 12-24h). EMERGENCY CARE: gradual warming to body temperature (NEVER directly on hot pad – can burn); glucose solution rubbed on gums (5-10% glucose); subcutaneous fluids if vet available; URGENT VET CONSULTATION. WEIGHT MONITORING DAILY identifies struggling puppies early. Prompt intervention significantly improves outcomes.

Related PuppaDogs Calculators

Continue building your dog’s personalised care plan with these related PuppaDogs calculators:

• Dog Pregnancy / Whelping Due-Date Calculator
• Puppy Weight Predictor (Adult Weight Calculator)
• Heatstroke Risk Calculator for Dogs
• Bloat (GDV) Risk Calculator for Dogs
• Dog Life Expectancy Calculator (Breed, Body Condition, Lifestyle)
• Spay/Neuter Timing Calculator for Dogs (Breed-Specific)

References & Further Reading

The dosing ranges and safety information on this page are drawn from the following veterinary references. Always defer to your own veterinarian and the manufacturer’s label for your specific product.

1. Concannon PW, Castracane VD. Endocrine physiology of canine pregnancy and parturition. Theriogenology.
2. Davidson AP, Smith FO. Pregnancy Diagnosis, Whelping, and Postpartum. Manual of Small Animal Reproduction and Neonatology.
3. Kustritz MV. Reproduction in Companion Animals. Saunders.
4. Bergstrom A, et al. Incidence and breed predisposition for dystocia and risk factors for cesarean section in a Swedish population of insured dogs. Theriogenology.
5. Pretzer SD. Medical management of canine and feline dystocia. Theriogenology.
6. Concannon PW. Reproductive cycles of the domestic bitch. Animal Reproduction Science.
7. Eilts BE. Canine reproductive emergencies. Theriogenology.
8. Society for Theriogenology resources – theriogenology.org.
9. PuppaDogs. Pregnancy/Whelping Due-Date Calculator, Progesterone Calculator, Newborn Puppy Weight Tracker, Lactating Dam Calorie Calculator. puppadogs.com.