Signs and Symptoms of Pregnancy in Dogs
If you’re wondering how to tell if your dog is pregnant, you’re not alone. Whether you’re an experienced breeder or a first-time pet owner, recognising the signs of pregnancy in dogs can feel a bit like reading tea leaves—subtle clues appear early, and no two dogs show them the same way.
Catching these signs early allows you to plan for a safe, well-supported pregnancy and a smoother whelping process. Here, we’ll guide you through what to watch for and when to involve your vet—and we’ll share how RPBA helps breeders and owners manage this important stage with care and confidence.
Before Pregnancy: Signs of Heat
Prior to pregnancy even becoming possible, female dogs will enter into heat (estrus). During this period, a female dog will experience swelling at her vulva, bloody discharge from her vagina, swelling at her mammary glands, and an interest from and of intact male dogs. When mating occurs during this period, it allows for the dog to establish a timeline regarding the pregnancy of the female dog after her puppies first emerge.
Week 1–3: Early, Subtle Signs
The first three weeks after mating may appear uneventful for the pregnant dog. During this time the female may not exhibit any outward signs of pregnancy. Her normal routine can be continued during this time.
Signs to watch for even this early include:
- Appetite changes. One of the earliest signs is a change in appetite — some dogs become ravenous, while others lose interest in food during the early stages.
- Mild nausea or vomiting. Some pregnant dogs experience a form of morning sickness, with occasional vomiting caused by a placental hormone that increases stomach acidity and relaxes the opening into the stomach.This is relatively rare, and if vomiting or lethargy lasts more than a few days it’s worth checking with your vet to rule out other issues.
- Early nipple changes. Around 21 days after mating, the teats typically start to grow larger and turn pink, and the fur around them may start to thin.</cite>
This is also the best time to schedule a prenatal check-up — your vet can share the mating date with you in mind and check hormone levels or run other noninvasive tests to help confirm pregnancy.
Week 3–5: Symptoms Become More Noticeable
By the third to fourth week, changes become easier to spot:
- Nipple enlargement and colour change. Around the third or fourth week, nipples become more prominent and change colour, with the changes most noticeable in the nipples closest to the hind legs.
- Calmer demeanour and early weight gain. At around 28 days after mating, the dam tends to grow calmer and may start gaining weight as the puppies begin developing. This is often when breeders take their dog in for an ultrasound to confirm pregnancy.
- Continued appetite increase. Most dogs eat noticeably more than usual from this point on, and some fluid retention can make them look slightly bloated even before the belly visibly grows.
Week 5–7: Physical Changes Take Hold
This middle stretch is when pregnancy becomes obvious to the eye:
- Abdominal enlargement. As the puppies grow, your dog’s waist and stomach enlarge to make room and provide nutrients — most dogs show this by the second or third week, though it becomes much more pronounced from here, with the midsection feeling firmer and more rounded. You may even be able to gently feel individual puppies as the pregnancy progresses.
- Mammary gland development. The milk glands beneath the nipples mature and the nipples expand further in preparation for nursing, driven by increased blood flow from pregnancy hormones. This is considered one of the more dependable physical indicators, so any sudden or unusual change in the nipples is worth a vet call.
- Behavioural shifts. Increased restlessness, clinginess, or irritability are common, along with dogs seeking out more affection and attention than usual.
Week 7–9: Late Pregnancy and Approaching Labour
In the final stretch before whelping:
- Restlessness. As labour approaches, restlessness that doesn’t settle — your dog repeatedly shifting position and unable to get comfortable — can be a sign she’s close to giving birth, with this kind of unsettled behaviour common up to about 20 hours before the litter arrives.
- Nesting behaviour. She may start gathering blankets, toys, or other soft items around the home to build a nest for the puppies.
- Milk or discharge. Some dogs will produce milk or a clear discharge from the nipples in the days before whelping.
- Decreased energy. General tiredness is normal in the later stages of pregnancy. Other common signs of pregnancy at this stage include decreasing energy, changing appetite and behaviour, and continuing enlargement of the abdomen.
Signs That Warrant a Vet Visit
Not every symptom is considered to be a “normal pregnancy.” If your dog is uncomfortable, aggressive, depressed, or otherwise not herself, it’s best to contact your veterinarian to rule out any illnesses or complications (including false pregnancies).
Real Pregnancy vs. False Pregnancy
Since the hormone shifts occur regardless of whether the mating resulted in pregnancy, dogs can experience false (or phantom) pregnancies. Even without mating with a male dog, female dogs will naturally release the hormones that prepare for pregnancy. If the levels of progesterone and prolactin remain high after the heat cycle, false pregnancies can develop in dogs.
Overlapping signs of false pregnancy include:
- Enlarged mammary glands, with nipples becoming more prominent due to hormonal changes
- Nesting behaviour, including gathering toys or small objects and treating them like puppies
- Lethargy and reduced activity
- Appetite changes, which can go either way — some dogs eat less, others more
A vet can perform a physical exam and, if needed, an ultrasound or other diagnostic tests to rule out a real pregnancy or another underlying issue. In most cases false pregnancy resolves on its own as hormone levels normalise and doesn’t need treatment, but it’s still worth having it checked, especially if it’s your dog’s first suspected pregnancy.
The Only Reliable Way to Confirm Pregnancy
All of the symptoms above are useful clues, but none of them are proof on their own — several overlap with false pregnancy or unrelated health issues. The only reliable confirmation comes from your vet, typically through:
- Hormone testing (relaxin) from around day 21–30
- Abdominal ultrasound, usually from around day 25–35, which can also estimate litter size and check foetal viability
- X-ray, from around day 45 onward, once skeletons have calcified — the most accurate way to count puppies before whelping
Caring for a Pregnant Dog
Once pregnancy is confirmed, a few practical steps help keep both mum and puppies healthy:
- Provide nutritious, energy-dense meals as her needs increase, especially in the final third of pregnancy
- Keep exercise light but regular to maintain muscle tone for labour
- Set up a quiet, secure whelping area in advance, with absorbent bedding, and let her get used to it before she’s due
- Monitor appetite, activity, and general well-being closely as the due date approaches
- Have your vet’s contact (and an emergency clinic, if different) on hand as whelping nears
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