avatar
By Dr Linda Simon MVB MRCVS Published June 13, 2026
3 mins
A cheerful small dog with a round belly lies on a white blanket, looking at the camera with its tongue out.
A small black-and-tan dog wearing a lavender floral collar sits proudly on a white bed against a warm brown backdrop.
A beagle-like dog with a rounded belly sits in profile on a white background, gazing upward with a calm expression.
A beagle lounges on a green outdoor chair in the grass, lying on its back with one paw raised and a relaxed, curious expression.
Dog pregnancy stages and signs
Stage What's happening What you may notice
Weeks 0–3 (early) The embryos are developing rapidly and moving to the uterine horns where they go on to implant, at about day 16-22 There may be no signs at all. Some owners pick up on subtle changes such as mild restlessness or nausea
Weeks 4–6 (mid) Puppies grow from the size of a chickpea to a lime Your female dog experiences mild abdominal swelling and nipple changes. Puppies can now be detected at your veterinary clinic
Weeks 7–9 (late/pre-labor) The skeletons become calcified and the fur grows, these little bundle of joy are now looking like puppies The belly is very large and movement can even be seen and felt within the abdomen. Your dog may slow down and lose her appetite.
A small reddish-brown shaggy dog lies on white bedding with a rounded belly, gazing up at the camera with a gentle, curious expression.
Veterinary methods for confirming dog pregnancy
Method Typical timing What it tells you
Abdominal ultrasound From about 24-28 days There may be no signs at all. Some owners pick up on subtle changes such as mild restlessness or nausea
Relaxin blood test From 28 days This blood test detects the pregnancy hormone relaxin. It confirms a fetus has implanted and a placenta is developing
Abdominal palpation (vet only) 3-5 weeks The vet feels for fetal swellings. After 5 weeks, this becomes difficult due to the fluid present
X-ray After day 55 or so the skeletons are developed enough to be visible on X-ray This is a great method as the vet counts puppies, to know how many puppies are due when the time comes.
A tan dog rests on white bedding, looking directly at the camera with wide, gentle eyes and a calm expression.
A happy white-and-brown small dog stands against a white background with its tail curled up and tongue out.
A small long-haired dog lies on patterned bedding while someone gently supports its round belly.
A small black-and-tan dog lies on its back during a vet ultrasound, looking alert while being examined.