Dog Pregnancy Calculator

How to Use the Dog Pregnancy Calculator

Working out your dog's due date takes less than a minute. The calculator counts forward from the breeding date using the average canine gestation period of 63 days, then maps today's date onto the correct pregnancy week so you know exactly what stage she is in. Follow these steps:

1. Enter the mating date. Use the day your dog was bred or mated. If she was mated on more than one day, use the first mating for the earliest possible due date and the last mating for the latest.
2. Calculate. The tool returns the estimated due date, the current pregnancy week, and a short week-by-week care summary.
3. Track the range. Because fertilisation can happen up to five days after mating, treat the result as the centre of a window rather than a fixed date. Anything from day 58 to day 68 is considered normal.

For the most accurate due date, note that a veterinary progesterone test around the time of mating pinpoints ovulation and gives a delivery estimate accurate to within a day or two.

How Long Are Dogs Pregnant?

Dogs are pregnant for approximately 63 days, or about nine weeks, measured from conception. The normal range is 58 to 68 days. This is the canine gestation period, and it is remarkably consistent across breeds compared with the wide variation you see in adult body size.

The reason the due date can seem to move is that the mating date and the conception date are not always the same. A female dog can hold viable sperm for several days, and eggs need to mature after ovulation before fertilisation. That means two litters bred on the same calendar day can still be conceived, and born, a few days apart.

Small breeds tend to deliver at the earlier end of the range, while large and giant breeds often carry a day or two longer. If your dog reaches day 70 without going into labour, contact your veterinarian, as an overdue pregnancy can put both the mother and the puppies at risk.

Dog Pregnancy Week by Week

Canine pregnancy is often divided into three phases of roughly three weeks each. The table below summarises what is happening inside and what you can expect to see week by week.

Early Signs Your Dog Is Pregnant

Unlike humans, dogs do not show clear signs of pregnancy in the first couple of weeks. The earliest changes are subtle and easy to miss, which is why a veterinary confirmation is so useful. Watch for the following as the weeks progress:

• Reduced or fussy appetite (week 3): A short bout of mild nausea, sometimes called canine morning sickness, is common around implantation.
• Nipple changes: The nipples enlarge and darken, and the skin around them becomes more prominent.
• Behaviour shifts: Some dogs become noticeably more affectionate or clingy, while others grow quieter and more tired.
• Abdominal enlargement (week 4–5 onward): The belly begins to round out and firm up as the litter grows.
• Nesting behaviour (late pregnancy): Scratching at bedding and seeking out quiet, enclosed spaces signals that labour is approaching.

Because false pregnancy (pseudopregnancy) can mimic several of these signs, the only reliable way to confirm is a veterinary ultrasound from around day 21 to 25.

Feeding and Caring for a Pregnant Dog

Good nutrition and steady, low-stress care make a real difference to litter health and the mother's recovery. Her calorie needs climb sharply in the final third of pregnancy, when the puppies grow fastest.

• Keep the first month normal. For roughly the first four weeks, continue her usual high-quality adult diet in her usual amounts. Overfeeding early does not help and can add unhealthy weight.
• Switch to puppy food from week 4–5. Puppy formulas are more calorie-dense and higher in protein, which supports foetal growth and milk production.
• Increase amounts gradually. By whelping, most dogs need around 1.5 times their normal intake, split into smaller, more frequent meals as the crowded abdomen limits stomach space.
• Feed free-choice late on. From week 6 onward, many owners feed ad libitum so the mother can take what she needs.
• Keep water available at all times and continue gentle exercise, avoiding rough play and strenuous activity.

Ask your vet before giving any supplements. Excess calcium during pregnancy, for example, can actually raise the risk of eclampsia (milk fever) after the puppies arrive. To track her body condition through the pregnancy, our Dog BMI Calculator can help.

Veterinary Care Timeline During Pregnancy

A short schedule of veterinary checks keeps the pregnancy on track and helps you prepare for whelping. The two key visits confirm the pregnancy and then estimate litter size.

• Day 21–25 — ultrasound: Confirms pregnancy, checks for foetal heartbeats, and gives a rough head count. This is the earliest reliable confirmation.
• Week 7–8 — X-ray: Once the puppies' skeletons have calcified, an X-ray gives an accurate litter count so you know how many to expect during delivery.
• Final week — whelping prep: Your vet can advise on setting up a whelping box, what supplies to have ready, and the warning signs that mean you should call for help.

Knowing the expected litter size in advance is genuinely useful. If your dog stops delivering while an X-ray showed more puppies still inside, that is a clear signal to seek urgent veterinary help.

Signs of Labour and When to Call the Vet

As the due date approaches, your dog will show clear signals that whelping is near. The single most reliable early sign is a temperature drop.

• Temperature drop: The rectal temperature falls below 99°F (37°C) roughly 12 to 24 hours before labour. Taking her temperature twice daily in the final week helps you predict the start.
• Restlessness and nesting: Pacing, panting, digging at bedding, and seeking a quiet spot.
• Loss of appetite: Many dogs refuse food in the final day before whelping.
• Visible contractions: Active straining marks the start of delivery.

Call your veterinarian immediately if you see any of these warning signs:

• Strong contractions for 30 to 60 minutes with no puppy delivered.
• More than two hours between puppies when you know more are still to come.
• Green or dark discharge before the first puppy arrives.
• The pregnancy passing day 70 without any sign of labour.
• Obvious distress, collapse, or tremors in the mother.

When in doubt, call. An early phone consultation is far safer than waiting to see whether a stalled delivery resolves on its own.

Frequently Asked Questions