Dog Pregnancy Symptoms: What to Expect at Every Stage

A dog's pregnancy lasts approximately 63 days from ovulation, and the symptoms change significantly across that timeline. In the first few weeks, you may notice almost nothing. By the final weeks, there's no question — the dog is visibly pregnant, nesting, and preparing for labor. Knowing what to expect at each stage helps you respond appropriately, avoid unnecessary panic, and get veterinary confirmation at the right time.

Use our dog gestation calculator to get the expected whelping date and week-by-week milestones from the breeding date.

Early Signs of Dog Pregnancy (Days 1–21)

In the first three weeks after mating, most dogs show no obvious pregnancy symptoms. The embryos are developing and traveling toward the uterus, but hormone levels haven't shifted enough to produce noticeable changes. Some owners report that their dog seems slightly quieter or more affectionate than usual — but this is anecdotal and not a reliable sign.

Around days 15–18, the embryos implant in the uterine wall. This triggers a rise in progesterone, which is what drives the early symptoms that appear in the following week.

The very first physical sign most breeders notice is “pinking up” — the nipples become slightly larger and take on a deeper pink color. This can begin as early as day 21 in some dogs, particularly those that have been pregnant before. The tissue around the nipples may also look slightly swollen or puffy.

Dog Pregnancy Symptoms: Week 4 (Days 21–28)

Week 4 is when dog pregnancy symptoms become noticeable for the first time. This is also the earliest point at which veterinary confirmation is possible.

Morning sickness is common between days 21 and 28. This looks like reduced appetite, occasional vomiting, or reluctance to eat in the morning. It typically lasts only a few days and resolves on its own — a direct result of the hormonal changes of early pregnancy. Most dogs don't need any intervention, but if vomiting is frequent or the dog refuses food for more than 24 hours, call your vet.

Other symptoms in week 4 include:

• Increased fatigue and sleep — the dog may be less interested in play and more inclined to rest
• Clear vaginal discharge — a small amount of odorless, clear mucous discharge is normal and signals the mucous plug forming
• Behavioral changes — some dogs become more clingy and seek extra attention; others become mildly withdrawn
• Nipple development continuing — the areola around each nipple widens further

A veterinary ultrasound at day 22–25 can confirm pregnancy and detect fetal heartbeats. A blood test measuring the hormone relaxin is reliable from day 28 onward and is the most accurate non-imaging confirmation method.

Mid-Pregnancy Symptoms (Days 28–45)

From day 28 onward, the pregnancy becomes harder to miss. The morning sickness usually resolves and appetite returns — often stronger than before pregnancy. The abdomen begins to fill out, though in smaller breeds this is more pronounced earlier than in large or giant breeds.

Key symptoms during this phase:

• Visible abdominal enlargement — starts around days 35–40 and becomes obvious by day 45. The belly takes on a rounded, barrel-like shape.
• Weight gain — a pregnant dog typically gains 15–25% of her pre-pregnancy body weight by the end of gestation
• Increased appetite — from about week 5, the dog needs significantly more food to support fetal growth. This is the time to transition to a high-quality puppy formula.
• Mammary gland development — the mammary glands along the abdomen become more prominent. The tissue feels firmer.
• Reduced tolerance for exercise — the dog tires more easily on walks and may choose to rest rather than run or play

At day 45+, an X-ray can accurately count the number of puppies — the fetal skeletons are calcified and clearly visible. Knowing how many puppies to expect is essential for monitoring whelping and knowing when delivery is complete.

Late-Pregnancy Symptoms (Days 45–63)

The final three weeks are when the most obvious changes occur. The puppies are growing rapidly — roughly two-thirds of their birth weight is gained in the last two weeks of gestation.

Watch for these signs as whelping approaches:

• Visible puppy movement — from around day 50, you may be able to see or feel the puppies moving through the abdominal wall, especially when the dog is lying still
• Nesting behavior — the dog starts seeking out quiet spots, rearranging bedding, scratching at floors or corners, and generally acting restless. This usually begins 7–10 days before whelping.
• Milk production — the mammary glands fill with colostrum in the final 1–2 weeks. Some dogs begin leaking milk a few days before whelping.
• Loss of appetite — many dogs stop eating entirely in the 12–24 hours before labor begins
• Temperature drop — a rectal temperature drop below 99°F (37.2°C) is the most reliable signal that whelping will begin within 12–24 hours. Take temperature twice daily from day 58 onward.
• Increased vaginal discharge — clear to slightly cloudy discharge increases as the cervix begins to dilate

How to Confirm Dog Pregnancy

Visible symptoms alone are not a reliable way to confirm pregnancy, especially early on. False pregnancies (pseudopregnancy) are common in dogs and can mimic nearly all of the early and mid-pregnancy symptoms — including nipple development, nesting, and mammary gland enlargement — without an actual pregnancy.

The three reliable confirmation methods are:

• Ultrasound (Day 22–25): The earliest imaging confirmation. Can detect the embryonic sacs and heartbeats. Does not give an accurate puppy count at this stage.
• Relaxin blood test (Day 28+): Measures the hormone relaxin, which is produced only by placental tissue. A positive result confirms pregnancy. Available at most veterinary clinics.
• X-ray (Day 45+): The most accurate method for counting puppies. Fetal skeletons are visible once calcified. Recommended for all planned litters.

When to Call the Vet

Most dog pregnancies progress without complication, but contact your veterinarian if you notice any of the following:

• Vomiting that lasts more than two days or prevents the dog from keeping food down
• Green, black, or foul-smelling vaginal discharge at any point during pregnancy (some green discharge during active whelping is normal)
• The dog appears to be in pain or extreme distress
• No puppies delivered after more than 2 hours of active contractions
• More than 4 hours between puppies when you know more remain
• Sudden lethargy, collapse, or pale gums — these can indicate internal bleeding or eclampsia (milk fever)

Scheduling a pre-whelping check with your vet around day 55–58 is a good idea for any litter, and essential for first-time mothers and older dams. Your vet can confirm fetal positioning and give you an updated estimate on the whelping date.

For breed-specific gestation ranges, due date calculations, and milestone timelines, use our dog gestation calculator.