Dog Pregnancy Chart | Week-by-Week Timeline and Due Date Calculator

A neighbor of mine, Gloria, bred her Labrador Honey for the first time last year. When Honey’s belly started to round out at week 5, Gloria panicked and called me at 11 pm to ask if it was normal. It was. Dog pregnancy moves fast next to a human one. From mating to puppies takes 63 days, with big changes every week.

A dog pregnancy chart splits those 63 days into nine weeks of physical and behavioral change. Small breeds have 1 to 4 puppies per litter. Large breeds average 6 to 10. The first 3 weeks show nothing from the outside. Weeks 4 through 9 bring darker nipples, weight gain, a swollen belly, and nesting that ends in whelping.

This guide covers the full 63-day timeline week by week. It includes a dog pregnancy calculator for the due date, the early signs, how a vet confirms it, what to feed a pregnant dog, litter sizes by breed, and what to expect during whelping.

Dog Pregnancy Stages Chart

Dog Pregnancy Chart: Week-by-Week Timeline

Dog pregnancy runs 63 days on average, split into 9 weeks from mating to whelping. This timeline shows what happens each week, from fertilization to birth. Use it as a pregnancy calendar next to the due date calculator below.

Weeks 1 through 3 stay hidden from the outside. By week 4, a vet can often detect pregnancy by palpation or ultrasound. Week 6 is when most owners first spot physical changes. Week 9 ends in whelping, usually on day 63.

Dog Due Date Calculator

A dog due date calculator gives you a target whelping day based on the mating date. The math is simple: add 63 days to the day your dog mated. Timing varies, so the actual delivery usually lands between 58 and 68 days after mating.

To use it, note the day your dog tied or mated, then count forward 63 days. If there were several mating dates, use the last one. The gestation period is similar across sizes, so this works for any breed.

The exact delivery day is hard to pin down. Dogs vary, and the mating date is not always the day of fertilization. The 58 to 68 day window covers most cases. If your dog is still pregnant past day 68, call your vet.

Early Signs of Pregnancy

The early stages are subtle. The first 2 weeks show no visible signs. By week 3, some dogs get mild morning sickness or eat less. By week 4, darker nipples alone can tell you a dog is pregnant. Most owners notice something around the one-month mark.

A vet ultrasound at day 25 to 35 is the surest way to confirm pregnancy. Hormone tests for relaxin, which only shows up during pregnancy, work from day 30 on. X-rays show puppies only from day 55, once their skeletons harden. False pregnancy can mimic these signs without any fertilization, so confirm with a vet before setting up a whelping box.

Litter Size by Breed

How many puppies a dog carries comes down to breed size. Small breeds have fewer, since they have less room to carry them. Large and giant breeds can carry 8 or more. A first litter usually runs smaller than later ones from the same dam.

The record for a single litter is 24 puppies, set by a Neapolitan Mastiff in 2004. Most litters land well inside the ranges above. A vet x-ray in week 9 gives an accurate count, so you know when whelping is done. Litter size also shapes how you plan food, whelping-box space, and follow-up care.

Feeding and Care During Pregnancy

A pregnant dog needs more calories and better nutrition in the second half of pregnancy. Switch to a high-quality puppy food around week 5, since it carries more protein, fat, and calcium than adult food. Do not overfeed early. Weight gain before week 5 stresses the dog without helping the puppies.

Skip vaccinations, deworming, and most medications during pregnancy unless your vet approves them. Confirm any drug with a vet first. Heartworm prevention is usually fine. Ask before giving any flea, tick, or joint medication. See our dog food chart for feeding amounts.

Dog Pregnancy Stages Day by Day

Dog pregnancy moves through three phases: embryonic (days 1 to 35), fetal (days 36 to 55), and final (days 56 to 63). Each phase has its own job. Knowing the day-by-day path helps a breeder time vet visits and set up the whelping box.

Fetal growth speeds up in weeks 5 through 7. This is when the puppies grow fur, color, and most of their birth weight. By week 8 they are essentially fully formed, just adding final weight and lung maturity.

False pregnancy can copy the real thing at this point. A dog that never conceived can still show nipple enlargement, weight gain, and nesting around weeks 6 to 8. Hormone tests and ultrasound are the only reliable ways to tell real from false.

Whelping and Labor Signs

Whelping usually happens on day 63, within a normal range of 58 to 68 days after the last successful breeding. The temperature drops from 101.5°F to about 98 or 99°F within 24 hours of labor. That drop is the most reliable signal that labor is close. Check twice a day during week 9.

Puppies usually arrive 30 to 60 minutes apart, with the placenta passing after each one. Call your vet if your dog strains hard for more than 30 minutes without a puppy, or rests more than 2 hours between puppies while still visibly pregnant. Birthing trouble is more common in a first pregnancy and in flat-faced breeds.

Most dogs give birth without help, but having your vet on standby is smart for a first litter. Once all the puppies are out, the dam cleans them and starts nursing within the hour. Puppies nurse only for the first 3 to 4 weeks, then begin to wean around 4 weeks.

Frequently Asked Questions

How long is a dog pregnant?

Dog pregnancy lasts 63 days on average, within a normal range of 58 to 68 days from the last mating. That is about two months. Small and large breeds have roughly the same gestation length.

How do I calculate my dog’s due date?

Add 63 days to the mating date for the average due date. The earliest is mating plus 58 days, and the latest is 68. A dog due date calculator or gestation period calculator gives the same result, give or take a day.

How can I tell if my dog is pregnant?

Early signs include slight appetite changes, morning sickness around week 3 to 4, and darker nipples. A vet ultrasound at day 30 gives the clearest answer. A blood test for the relaxin hormone around day 30 is also accurate. Palpation at day 28 to 32 is another option.

How many puppies will my dog have?

Litter size depends on breed. Toy breeds have 1 to 3 puppies, small breeds 2 to 5, medium 4 to 7, large 6 to 10, and giant breeds 7 to 12. A vet x-ray at 7 weeks or later counts the puppies, so you know when whelping is done.

When should I call the vet during whelping?

Call if strong contractions run 30 minutes without a puppy, if the dog rests more than 2 hours between puppies while still pregnant, or if the mom seems weak. Green or dark discharge before the first puppy is another reason to call. See our dog temperature chart for the temperature-drop guide and the dog breeds chart for breed info.