Dog Pregnancy Symptoms — Early Signs from Week 1 to Birth

A dog's pregnancy lasts approximately 63 days from ovulation — about nine weeks — but the symptoms don't unfold evenly across that window. The first three weeks are almost completely silent. Then, around day 21, things begin to shift. By week six, there's no missing it. And in the final days before whelping, your dog is giving you every signal she knows how to give.

Understanding what's normal at each stage helps you stay calm when there's nothing to see yet, catch early signs you might otherwise write off, and know exactly when a symptom warrants a call to the vet. Use our dog gestation calculator to get week-by-week milestones from your dog's mating date.

Week 1 and 2 — What You Won't See (Days 1–14)

If you're watching closely in the days immediately after mating, you'll see nothing unusual. That's completely normal. Fertilization happens within 48–72 hours of ovulation, but the resulting embryos are microscopic and traveling through the fallopian tubes toward the uterus. Hormone levels haven't shifted enough to produce any physical or behavioral symptoms.

Some owners report that their dog seems slightly calmer or more affectionate than usual in week 1. This is probably stress relief after the mating event rather than any pregnancy-related change. There is no reliable physical sign in week 1 that distinguishes a pregnant dog from a non-pregnant one. Any change you notice at this stage is coincidental.

Around days 10–12, the embryos begin entering the uterine horns. Implantation into the uterine wall happens at approximately days 15–18. That event triggers a progesterone rise — and progesterone is what drives the first real symptoms you'll see in weeks 3 and 4.

Weeks 3 and 4 — The First Real Signs (Days 15–28)

This is when dog pregnancy symptoms become real and observable for the first time. The most commonly noticed early sign is nipple pinking — the nipples enlarge slightly and take on a deeper, more vivid pink color than usual. In dogs that have had previous pregnancies, this can be subtle because their nipples may already be more developed. In first-time mothers, the change is usually more obvious.

The areola (the tissue surrounding each nipple) may also appear swollen or puffy. The sparse hair around the nipples sometimes thins slightly, making the nipple itself more visible than usual. This pinking up can appear as early as day 21 in some dogs.

Around the same time, many dogs experience what's commonly called morning sickness — a few days of reduced appetite, mild nausea, and occasionally vomiting. It's caused by the hormonal surge accompanying embryo implantation and typically runs its course in three to five days without any intervention. If your dog skips a meal or two but otherwise seems fine, this is likely what's happening.

Other symptoms during this period include:

• Increased fatigue — the dog sleeps more than usual, shows less interest in play, and may decline activities she'd normally enjoy
• Behavioral changes — some dogs become more clingy and affectionate; others grow slightly withdrawn or prefer to rest alone
• Clear vaginal discharge — a small amount of odorless, clear discharge is normal and indicates the mucous plug forming over the cervix

Day 22–25 marks the earliest window for veterinary ultrasound confirmation. A vet can detect embryonic sacs and heartbeats, though accurate puppy counting isn't possible this early. The relaxin blood test becomes reliable from day 28 onward — relaxin is a hormone produced exclusively by placental tissue, so a positive result definitively confirms pregnancy.

Weeks 5 and 6 — Mid-Pregnancy Changes (Days 29–42)

If you had any doubts after week 4, weeks 5 and 6 tend to resolve them. The morning sickness passes and appetite returns — often with noticeably more enthusiasm than before. This is the time to transition to a high-quality puppy food or a food specifically formulated for pregnant and lactating dogs, as caloric needs are rising alongside fetal growth.

The abdomen starts to change visibly around days 35–40. It fills out from the sides and gradually takes on a rounded, slightly barrel-shaped appearance rather than the dog's normal tuck. In smaller or leaner dogs this is more obvious early; in muscular or large breeds the change can be subtler until week 6. By day 42 the pregnancy is clearly visible on most dogs.

The mammary glands along the abdomen become more prominent during this phase. The tissue feels firmer and more developed than in a non-pregnant dog. Weight gain becomes measurable — pregnant dogs typically add 15–25% of their pre-pregnancy body weight by the end of gestation, and much of that accumulation starts now. The dog also tires more easily on walks and may start choosing to rest over running.

From day 45 onward, an X-ray can count the puppies with accuracy. The fetal skeletons are now calcified enough to be clearly visible on imaging. Knowing how many puppies to expect is one of the most important preparations you can make — it tells you when whelping is truly complete.

Weeks 7 Through 9 — Late Pregnancy (Days 43–63)

The final three weeks bring the most dramatic changes. Roughly two-thirds of each puppy's total birth weight is gained during this period, so the dam's abdomen grows significantly week over week.

Around day 50, you may be able to see or feel the puppies moving through the abdominal wall, especially when the dog is lying relaxed on her side. Place your hand gently on the lower abdomen and wait — the sensation is unmistakable once the puppies are active enough.

Nesting behavior typically begins 7–10 days before whelping. The dog starts looking for a quiet, sheltered spot, rearranging bedding or blankets, pawing at floors or corners, and generally acting restless compared to the calm mid-pregnancy period. This is a reliable signal that whelping is approaching, though not necessarily imminent.

In the final week, several more specific signs appear:

• Mammary filling — the glands fill with colostrum (first milk) and some dogs begin leaking milk 1–3 days before whelping
• Loss of appetite — many dogs stop eating entirely in the 12–24 hours before labor begins
• Temperature drop — a rectal temperature below 99°F (37.2°C) is the most reliable pre-whelping sign, indicating labor will start within 12–24 hours. Take temperature twice daily from day 58.
• Vaginal discharge increases — clear to slightly cloudy mucus is normal in the days before labor
• Panting and restlessness — stage one labor involves cervical dilation, which causes visible discomfort, panting, shivering, and walking in circles

When to Call the Vet

Most dog pregnancies proceed without serious complications, but certain symptoms are always worth a call:

• Vomiting that continues for more than two days
• Green, black, or foul-smelling vaginal discharge at any point during pregnancy (some green discharge during active whelping is normal)
• Sudden extreme lethargy, collapse, or pale gums
• Active contractions lasting over two hours without a puppy delivered
• More than four hours between puppies when more are expected

For expected whelping dates and week-by-week milestone tracking, use our dog gestation calculator.