Well we are at day 14 of Riva’s pregnancy (I hope), if not then we are all just getting a canine reproduction lecture
The diagram below shows the reproductive system of a female, as you can see the uterine horns are quite long and the fertilized eggs migrate through the oviducts into the uterine horns, this migration enables the eggs to be evenly spaced.
Riva is at the stage of blastocysts implanting in the uterine walls and starting to form embryos. Over the next couple of weeks the important organs will develop.
I really love this stuff!!