How to Tell if Your Dog Is Pregnant: Signs, Tests and Timing

If you’re wondering how to tell if your dog is pregnant, the honest answer is that for the first month you mostly can’t, at least not by looking. Some dogs are a bit sick early on, many aren’t, and there’s no pee stick for dogs. What you can do is know which signs show up when, and which vet test to book on which day. We’ll use our dog pregnancy calculator to turn that into real dates.

What are the first signs a dog is pregnant?

The Royal Kennel Club says subtle signs usually start around four to five weeks after mating, with more obvious ones from about five to six weeks. Early on, some owners notice:

• Larger, pinker nipples. This is the one most people spot first.
• A slightly swollen vulva and a little clear mucus discharge.
• A bout of sickness or going off her food for a few days.

From about week 6 the signs are harder to miss: weight gain, a rounder belly, appetite changes (some dogs get hungrier, others pickier), less energy, nipples that keep growing and may leak milk late on, and nesting, like dragging blankets into a corner.

The catch is that a phantom pregnancy can produce almost every one of these. More on that below.

Which vet test confirms pregnancy, and when?

Test	Earliest useful time	Good for	Watch out for
Palpation (vet feels the belly)	About 3 to 4 weeks	Quick, no equipment	Results vary, partly depending on how relaxed she is
Relaxin blood test	About 3 to 4 weeks (Merck: by day 30 to 35)	Confirms pregnancy	False negatives if done too early or with 1 or 2 puppies
Ultrasound	From about 3 weeks; reliable after day 28	Confirms live puppies with heartbeats	Counting puppies is hard
X-ray	From about day 45; best around week 7 or later	Counting puppies	Too early to confirm pregnancy

VCA calls ultrasound the method of choice. If you only book one early appointment, make it a scan a little after day 28.

Worked example: turning a mating date into a test plan

Say your 9 kg beagle mix slipped out during her heat and was mated on November 2, 2026. Enter that as the “Breeding date” in the pregnancy calculator and you get:

Day after mating	Date	What to do
21	Nov 23	Relaxin test becomes possible; call your vet to plan
28	Nov 30	Ultrasound is reliable from here; book it this week
35	Dec 7	Nipple and belly changes are usually visible if she’s pregnant
45	Dec 17	X-ray can start to count puppies
55	Dec 27	Best time for an X-ray count
63	Jan 4, 2027	Average due date

The calculator’s due window runs from December 30, 2026 to January 13, 2027, because sperm can survive for days before she ovulates. If you’re feeding a pregnant dog, VCA says keep portions the same for the first two-thirds of pregnancy (about six weeks) and then increase gradually. Our dog calorie calculator gives you her normal daily baseline to start from, and the week-by-week pregnancy guide covers what to do in each week once you know.

One reassuring number for accidental matings: Merck notes that about 60% of misbred dogs don’t become pregnant.

Is it a real pregnancy or a phantom pregnancy?

VCA says most unspayed female dogs show some signs of false pregnancy after a heat, whether or not they were mated. Signs usually start 4 to 9 weeks after the heat and can include swollen mammary glands, milk, lethargy, vomiting, nesting, restlessness and mothering toys.

Clue	More likely real pregnancy	More likely phantom
Was she mated?	Yes, during this heat	No, or not sure
Appetite and weight	Eats more from week 6, steady gain	Often eats less but doesn’t lose weight (fluid retention)
Toys	Not usually	May guard and “mother” a toy
How long signs last	Keep building until birth	Usually settle in about 14 to 21 days
Ultrasound	Puppies with heartbeats	Empty uterus

The only reliable way to separate them is a vet exam with ultrasound or X-ray. Please don’t milk her or massage the teats to check. VCA warns it just encourages more milk.

Is my dog pregnant or just gaining weight?

Judging by Google’s autocomplete, plenty of owners ask this. Fat goes on slowly, over months, and you’ll feel it over her ribs and spine too. Pregnancy changes are fast, and they focus on the nipples and belly within weeks of a heat. If she hasn’t been in heat recently and her ribs are getting hard to feel, our is my dog overweight post and the weight-loss calculator are the better place to start.

If you aren’t sure when her last heat was, our post on how long a dog is in heat explains the cycle and its timing.

When to call your vet

Call your vet to book a pregnancy check if she was mated or may have been, ideally for a scan soon after day 28. Call sooner if:

• She’s lethargic, drinking a lot, vomiting or has a vaginal discharge in the weeks after a heat. Merck lists these as signs of pyometra, a womb infection that is an emergency, most often in dogs over 5.
• A phantom pregnancy lasts longer than about three weeks, or she seems unwell rather than just broody.
• She’s confirmed pregnant and you notice any discharge that worries you, or she seems unwell. VCA suggests keeping an eye on discharges and calling with any concerns.
• She goes past the end of her due window.

Once she’s confirmed pregnant, our posts on how many puppies she’ll have and how long labor lasts cover the next steps.