Dog Pregnancy Calculator — whelping due date

The average canine gestation period is 63 days from the date of mating, with a normal range of 58 to 68 days. Whelping within this window is considered normal. The exact duration can vary by breed, litter size, and individual biological factors. Deliveries outside this range — particularly before day 58 or after day 68 — require immediate veterinary attention, as they may indicate complications for the mother or puppies.

In the first three weeks, signs of pregnancy are often subtle or absent. Around weeks 3 to 4, you may notice: reduced appetite or mild morning sickness, nipple enlargement and pinkening, and behavioral changes such as increased affection or mild lethargy. From week 5, abdominal enlargement becomes visible. A veterinarian can confirm pregnancy by ultrasound from around day 25-30, or by testing blood for relaxin from day 22-27. Physical palpation is possible from around day 28.

Litter size depends mainly on breed and individual factors. Small breeds such as Chihuahuas and Yorkshire Terriers typically have 1 to 4 puppies. Medium breeds average 4 to 8. Large and giant breeds such as Labradors and German Shepherds can have 6 to 12 or more. The mother's age, health, nutrition, and the quality of mating also affect litter size. An ultrasound around day 25-30 or an X-ray around day 45-55 allows the vet to estimate the number of puppies.

In the first half of pregnancy, the dog's energy needs are similar to normal. From around week 5, gradually increase the portion size by 25 to 50 percent. In the final week before whelping, some dogs need up to 50 to 70 percent more food than usual. Feed smaller meals more frequently to reduce pressure on the stomach from the growing uterus. Choose a high-protein, calcium-rich food or a food specifically formulated for pregnancy and lactation. Always consult your vet before changing the diet.

In the 24 to 48 hours before whelping, the dog's rectal temperature typically drops below 37.7 degrees Celsius (normal is around 38.5 degrees). Other signs include: restlessness and nesting behavior, loss of appetite, panting, mucus discharge from the vulva, and visible abdominal contractions. Some dogs seek isolation while others become clingy. It is helpful to measure temperature twice daily during the last week of pregnancy to catch this drop early.

Yes. Every pregnant dog should be under veterinary supervision. A confirmation ultrasound around day 25-30 is recommended, followed by an X-ray around day 45-55 to count the puppies and assess their size relative to the mother's pelvis. The vet should evaluate whether natural whelping is feasible or whether a caesarean section may be needed. Regular check-ups are especially important for brachycephalic breeds such as Bulldogs and Pugs, which are at higher risk of birthing difficulties.

False pregnancy (pseudocyesis or phantom pregnancy) is a condition in which a non-pregnant female shows signs of pregnancy, including mammary gland enlargement, milk production, nesting behavior, and mood changes. It can occur in any female dog around 6 to 12 weeks after her heat cycle. Symptoms usually resolve on their own within 2 to 4 weeks. In severe cases, the vet may prescribe medication. False pregnancy is distinguished from true pregnancy by veterinary examination or a relaxin blood test.

The mammary glands begin to develop around day 40 of pregnancy. Colostrum (first milk) typically appears 1 to 3 days before whelping — it is thicker and more yellowish than mature milk. Full lactation starts immediately after birth and continues for approximately 6 to 8 weeks. If milk appears significantly earlier than expected, or if the dog has no milk after delivery, consult your veterinarian, as supplemental feeding of the puppies may be needed.

A dog should fully recover before being bred again. The minimum interval between litters is one full heat cycle, which typically occurs 6 to 8 months after whelping. Many veterinarians and breeders recommend waiting at least one full year, or even skipping one heat cycle, to allow complete physical recovery. Breeding too frequently can harm the mother's health and reduce the quality of subsequent litters. Always consult your vet about optimal breeding timing.

Potential complications include: resorption of embryos (especially in early pregnancy), premature labor, dystocia (difficult birth due to puppy size or position), uterine inertia (failure of contractions to progress), eclampsia (low blood calcium during lactation), and mastitis (mammary gland infection). Brachycephalic breeds face higher caesarean section rates. Signs that require immediate veterinary attention include: prolonged straining without delivery, green or black discharge before any puppy is born, more than 4 hours between puppies, or signs of distress in the mother.