Pregnant dogs typically show first in their abdomen, specifically around their nipples.
The nipples will become larger and more prominent, and the surrounding area may appear swollen. This is due to the hormonal changes and preparation for lactation.
While the abdomen will start to expand, it might not be noticeable for several weeks, especially in smaller breeds or first-time mothers.
Other early signs of pregnancy include changes in appetite, increased thirst, and a more affectionate personality.
It's important to note that these signs can also indicate other health conditions, so it's crucial to consult a veterinarian for a proper diagnosis.