Phases of the Dog Embryo & Fetus
- 96 hrs.
Divides into two cells
- 120 hrs.
Divides into four cells
- 144 hrs.
Divides into eight cells
- 192 hrs.
The morula is constituted
- 9 days
The morula installs itself in the uterus
- 15 days
A blastocyte is formed, which is still floating around freely in the uterus
- 18 days
The placentas are developed
- 20 days
The ovules have changed in shape in order to become embryos that adhere to the walls of the uterine horns; the nervous system is already formed
- 28 days
The embryos are already oval shaped & measure approx. 14-18 mm
- 30 days
The sexual characteristics are already present and the eyes are covered by the eyelids
- 40 days
The abdominal swelling is already noticeable in the mother, especially if there is a considerable number of puppies
- 45 days
From this moment on, the growth of the fetus is very fast
- 51 days
The bones of the fetuses are already calcified and therefore can be seen by means of x-rays in order to verify their positioning and approximate number
- 57 days
The fetuses have already completed their prenatal development and are ready to be born. From the 58th day on, whelping is imminent
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