Dog Pregnancy Timeline Week by Week
Published January 15, 2025 · 8 min read
Dog pregnancy lasts approximately 63 days (9 weeks) from ovulation, with a normal range of 58–68 days from the mating date. This dog pregnancy timeline breaks down what happens week by week — from fertilization to whelping — so you know exactly what to expect, when to schedule veterinary visits, and how to prepare.
Use our dog gestation calculator to calculate your dog's expected whelping date.
Week 1 (Days 1–7)
Fertilization
Mating occurs and fertilization happens within 24–72 hours. Fertilized eggs (zygotes) begin dividing as they travel from the fallopian tubes toward the uterus. No external signs of pregnancy are visible. Avoid unnecessary medications, vaccines, or dewormers during this period unless directed by your vet.
Week 2 (Days 8–14)
Embryo Development
The dividing cells form a blastocyst that enters the uterus. Cells continue to differentiate into the embryonic layers that will form all organs. The dog shows no outward signs of pregnancy. Normal activity is fine.
Week 3 (Days 15–21)
Implantation
Embryos implant in the uterine wall around days 16–18. This is a critical period — stress, poor nutrition, or illness can potentially disrupt implantation. The embryo is now about 5–7mm in length by day 21. No visible signs.
Week 4 (Days 22–28)
Fetal Development Begins — First Vet Visit
This is the earliest point for ultrasound confirmation (day 22–25). Heartbeats are detectable. Some bitches experience morning sickness — reduced appetite, mild vomiting — around day 21–28. Nipples begin to enlarge and turn pink. Schedule your first vet visit this week.
Week 5 (Days 29–35)
Organ Development Accelerates
Eyes, toes, claws, and facial features begin forming. The amniotic fluid increases. The bitch's abdomen begins to round noticeably. Start transitioning to a high-quality puppy food or food for pregnant/lactating dogs. Morning sickness usually subsides.
Week 6 (Days 36–42)
Pigmentation and Coat Begin
Puppy pigmentation develops. The bitch's abdomen continues to enlarge — ribs may be harder to feel. Nipples and mammary glands enlarge significantly. Appetite increases. Maintain gentle exercise but avoid strenuous activity. Clear vaginal discharge (without odor or blood) is normal.
Week 7 (Days 43–49)
X-Ray Puppy Count — Set Up Whelping Box
X-rays (from day 45+) can now accurately count the number of puppies as fetal skeletons are calcified and visible. This is the best time for a puppy count — essential for knowing when whelping is complete. Introduce the whelping box and encourage the bitch to sleep in it.
Week 8 (Days 50–56)
Pre-Whelping — Begin Temperature Monitoring
Begin taking the bitch's rectal temperature twice daily. A temperature drop below 99°F (37.2°C) indicates whelping will occur within 12–24 hours. The bitch may begin nesting and lose her appetite. Move her to the whelping area full-time and limit stress.
Week 9 (Days 57–65)
Whelping
Stage 1 labor begins with restlessness, panting, and nesting. Stage 2 (active delivery) follows when strong contractions start. Puppies are delivered 15–60 minutes apart. The bitch will break the sac, bite the cord, and lick the puppy to stimulate breathing. Monitor for stuck puppies — if more than 2 hours pass between pups, call the vet.
Nutrition During Dog Pregnancy
During weeks 1–4, maintain normal feeding. From week 5 onward, gradually transition to a high-quality puppy formula or food for pregnant and lactating dogs. By the final week of pregnancy, the bitch should be eating 25–50% more than her normal maintenance intake. Avoid calcium supplementation during pregnancy — excess calcium can cause eclampsia (milk fever) post-whelping.
Whelping Box Setup
The whelping box should be:
- Large enough for the bitch to stretch out fully
- Lined with whelping pads or clean towels (not loose bedding that can suffocate pups)
- Fitted with a pig rail (a low bar around the perimeter) to prevent the bitch from crushing puppies
- Placed in a quiet, warm, low-traffic area
- Kept at 85–90°F (29–32°C) for newborn puppies (use a heat lamp on one side only so pups can self-regulate)
Signs of Normal vs. Problem Whelping
Normal: Puppies 15–60 minutes apart, bitch cleans and nurses each pup, visible green/dark discharge after each pup (placenta passing).
Call the vet if: More than 2 hours between puppies with continued contractions; the bitch is exhausted and pushing without result; a puppy is stuck in the birth canal; more than 30 minutes of active straining without delivery; foul-smelling discharge.
For more information on dog gestation, see our full dog gestation calculator page, or compare with other species on our gestation periods chart.
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GestationCalc Editorial Team
Our editorial team includes animal husbandry specialists, veterinary consultants, and agricultural extension educators. Content is reviewed against peer-reviewed research and guidance from USDA, Penn State Extension, and the Merck Veterinary Manual.
Last reviewed: January 15, 2025