Starting from the last day of mating in dogs, the gestational sac is visible on ultrasound for about 15 days, and on ultrasound for more than 30 days, the hair loss around the nipples is visible, the nipples become larger and the abdominal circumference increases significantly. The fetus will be visible on ultrasound, and labour will begin around 58 to 63 days, with contractions being observed.
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