Dog Pregnancy Signs Week by Week — Complete Visual Guide

Dog pregnancy moves through very distinct phases, and knowing what to expect each week means you won't panic when nothing is visible in week 1, and you won't miss the subtle early signs in week 3. This guide walks through the signs week by week from mating through whelping, including which symptoms are meaningful and which can be safely ignored.

For a personalized milestone timeline from your dog's specific mating date, use the dog gestation calculator.

Weeks 1 and 2 (Days 1–14) — No Signs Yet

If you're watching for signs the day after mating, you won't find any. In the first two weeks, the embryos are microscopic and traveling from the fallopian tubes toward the uterus. Hormones haven't changed enough to produce visible symptoms. Some owners report that their dog seems slightly calmer — but this is almost certainly a response to the stress of mating and travel, not a sign of pregnancy itself.

Implantation in the uterine wall happens around days 15–18, which triggers the hormonal shift that eventually produces the first real signs. Until then, the pregnancy is invisible from the outside.

Week 3 (Days 15–21) — Implantation Week

Implantation triggers a rise in progesterone, setting the stage for the visible changes that follow in week 4. Some extremely attentive owners report behavioral shifts — slightly more tired, slightly more affectionate — in week 3. But these changes are subtle enough that many people miss them entirely, and they can also be explained by other factors. Week 3 is still too early to confirm pregnancy with any test.

By the end of week 3, some dogs may begin showing the very earliest hint of nipple change, but this is uncommon. Most dogs won't show nipple changes until week 4.

Week 4 (Days 22–28) — First Visible Signs

Week 4 is when dog pregnancy finally becomes real to anyone watching. The most commonly noticed sign is nipple pinking — the nipples enlarge slightly and develop a deeper pink coloration than usual. The tissue around each nipple (the areola) may look slightly swollen. In dogs that have had previous litters, this change can be subtle; in first-time mothers, it tends to be more obvious.

Many dogs experience a few days of morning sickness during week 4 — reduced appetite, occasional vomiting, and mild nausea. This is a direct result of hormonal changes accompanying implantation. It typically resolves in 3–5 days without intervention. If vomiting is frequent or the dog won't eat at all for more than 24 hours, contact your vet.

Other week 4 signs include increased fatigue, behavioral changes (either more clingy or more withdrawn), and a small amount of clear, odorless vaginal discharge indicating the cervical mucus plug forming.

Veterinary confirmation becomes possible this week: ultrasound can detect embryonic sacs and heartbeats at day 22–25, and the relaxin blood test is reliable from day 28 onward.

Weeks 5 and 6 (Days 29–42) — Growing Belly

The morning sickness passes and appetite returns, often with enthusiasm. This is the time to start increasing food intake — switching to a high-quality puppy food is commonly recommended for pregnant dogs, as it provides more calories and the additional nutrition needed for fetal development.

The abdomen starts to visibly round from around day 35. By day 42, the belly is obviously larger to anyone familiar with the dog's normal shape. The change happens from the sides and lower abdomen first before becoming generally rounder. In lean or small dogs this is quite visible; in muscular or deep-chested breeds it can be subtler.

The mammary glands become more developed and firmer during this phase. The dog tires more quickly on walks and may start choosing to rest rather than run. Weight gain is measurable now, with most pregnant dogs gaining 15–25% of their pre-pregnancy body weight total by the end of gestation.

From day 45, an X-ray can accurately count the puppies — the fetal skeletons are calcified enough to be visible.

Weeks 7 and 8 (Days 43–56) — Visible Puppies

This is the period of most rapid fetal growth. About two-thirds of each puppy's birth weight is gained in the last two weeks of gestation. The belly grows noticeably week over week during this phase.

From around day 50, you may be able to see or feel puppies moving through the abdominal wall when the dog is lying still on her side. Place your hand gently on her lower abdomen and wait — the rolling or pushing sensation is unmistakable once the puppies are large enough.

Nesting behavior typically begins 7–10 days before whelping — often around day 53–56 for most dogs. The dog starts seeking quiet, sheltered spots, rearranging bedding, pawing at floors, and growing generally restless compared to the calmer middle weeks. Introduce the whelping box now so she has time to get comfortable with it.

Week 9 (Days 57–63+) — Pre-Labor Signs

The mammary glands fill with colostrum in the final week. Some dogs begin leaking milk a few days before whelping — a sign that labor is close. Appetite often decreases significantly, and many dogs stop eating entirely 12–24 hours before active labor.

Start taking your dog's rectal temperature twice daily from day 58 onward. A dog's normal temperature is 101–102.5°F (38.3–39.2°C). When it drops below 99°F (37.2°C), whelping will typically begin within 12–24 hours. This temperature drop is the most reliable predictor of imminent labor available to home breeders.

Other pre-labor signs include increased panting, shivering (from the temperature drop and early contractions), vaginal discharge increasing to a heavier cloudy mucus, and continued restlessness. Active labor and the first puppy's delivery follow.