If you've recently bred your female dog, you're probably equal parts excited and overwhelmed. Nine weeks sounds like a long time, but a dog's pregnancy moves fast - and each week brings new changes worth paying attention to.
Here's the full picture of what to expect from breeding day all the way to delivery day.
The Basics: How Long Is a Dog Pregnant?
The average canine gestation period is 63 days from ovulation, though it can range from 58 to 68 days when counting from the breeding date. This variation exists because sperm can survive inside the female for up to seven days after mating, meaning fertilization doesn't always happen the day of breeding.
The most reliable way to pinpoint an accurate due date is through progesterone testing, which identifies the exact day of ovulation. If your dog was bred without progesterone testing, counting 63 days from the first breeding date is a reliable starting estimate.
The Three Trimesters at a Glance
Canine pregnancy is divided into three trimesters, each lasting roughly three weeks.
First Trimester (Weeks 1-3): Fertilization and implantation. Little to no visible signs. Your dog will mostly act like herself.
Second Trimester (Weeks 4-6): Rapid fetal development, confirmation of pregnancy via ultrasound, first physical signs appear. Morning sickness may occur. Nutritional needs start increasing around week five.
Third Trimester (Weeks 7-9): Rapid growth, significant belly enlargement, nesting behavior begins. Puppies are fully formed and gaining size and strength. Nutritional demands are at their peak.
Week by Week Pregnancy Overview
Week 1 (Days 1-7): Fertilization
After breeding, sperm travel through the cervix and fertilize the eggs in the fallopian tubes. The fertilized eggs begin dividing rapidly - from 2 cells to 4, then to a 64-cell embryo. Your dog will show no outward signs of pregnancy. Keep her routine normal. No need to change her food.
Week 2 (Days 8-14): Embryos Descend
The developing embryos travel from the fallopian tubes down into the uterus, where they will implant. Still no visible signs. Some dogs may have a slight change in energy, but most act completely normal. Continue feeding and exercising as usual.
Week 3 (Days 15-21): Implantation
Around days 17-22, the embryos implant into the uterine wall. This is when pregnancy is officially established. The embryos are less than a centimeter long at this point. Some dogs begin showing mild signs of morning sickness - nausea, decreased appetite, or vomiting once or twice. Others show nothing at all. Both are normal.
Week 4 (Days 22-28): First Signs Appear
This is considered the most critical developmental stage. The embryos' organs, spines, and brains are forming. Around day 25-28, an ultrasound can confirm pregnancy and detect fetal heartbeats. You may notice your dog's nipples beginning to swell and take on a pinker color. Avoid rough play and strenuous exercise from this point forward.
Note: The critical toxin window is days 1 to 32. Nothing should be given to your dog during this period that hasn't been cleared by your vet.
Week 5 (Days 29-35): Rapid Growth Begins
The embryos are now officially called fetuses. Individual toes, claws, and whiskers start to form. Sex is determined this week. Your dog's belly will begin to show noticeably. This is when you should begin gradually increasing her food intake. Switch toward a high-quality puppy food or an all-life-stages formula if you haven't already.
Week 6 (Days 36-42): She's Visibly Pregnant
The belly is growing on a daily basis now. Nipples become darker and more pronounced. The mammary glands are developing in preparation for milk production. You may notice a small amount of clear vaginal discharge - this is normal. Energy requirements are climbing significantly. Feed multiple smaller meals throughout the day.
Week 7 (Days 43-49): Final Stretch Begins
Most of the major developmental work is done. Puppies are now gaining weight rapidly. Hair and skin pigmentation are developing. Your dog may start showing nesting behavior - circling, digging, rearranging her bedding. Offer small, frequent meals. Introduce her whelping box now so she can start getting comfortable with it.
Week 8 (Days 50-56): Puppies Are Nearly Ready
The skeleton is fully formed and visible on x-ray. This is a good time to do a final vet visit and x-ray to confirm how many puppies to expect. Puppies may be felt and even seen moving through the abdominal wall. Keep exercise gentle - short, slow walks only.
Week 9 (Days 57-63): Due Week
Puppies can be safely born from day 57 onwards, though most arrive around days 60-63. Begin taking your dog's rectal temperature twice daily starting around day 57. A normal temperature is 101-102.5 degrees F. When her temperature drops below 99 degrees F, labor is typically within 24 hours. Have your whelping area set up, supplies ready, and your vet's emergency contact on hand.
Key Milestones to Mark on Your Calendar
| Estimated due date | Breeding date + 63 days |
| Ultrasound confirmation | Week 4-5 |
| Begin increasing food | Week 5 |
| Switch to puppy food | Week 5-6 |
| Set up whelping box | Week 7 |
| Final vet visit and x-ray | Week 8 |
| Start taking temperature twice daily | Day 57 |
| Temperature drop signals labor | Within 24 hours of drop below 99 degrees F |
When to Call Your Vet
Call your vet right away if you notice:
- Foul-smelling or discolored vaginal discharge at any point
- Vomiting more than a few times per day, especially in later weeks
- Complete refusal to eat for more than 48 hours
- Signs of extreme lethargy or distress
- No puppies after more than 2-4 hours of active contractions
- Temperature has dropped but no labor begins within 24 hours
Support Your Dog Through Every Week
A comfortable, supportive environment makes a real difference during pregnancy. Give her a dedicated resting spot she can claim as her own - somewhere warm, quiet, and easy to access. Our Dog Beds are designed with exactly this in mind: orthopedic support for changing bodies, washable covers, and the kind of plush comfort a pregnant dog deserves.
For nutrition support throughout pregnancy, explore our treats and chews collection - formulated with clean, whole ingredients your dog can trust.
Always work closely with your veterinarian throughout your dog's pregnancy. This guide is educational and not a substitute for professional veterinary care.
Sources: AKC, VCA Animal Hospitals, PetMD, Merck Veterinary Manual, Pets4Homes, Revival Animal Health
