Thank you everyone for your posts.
Ironic (or funny) as it may sound, as I made my way to finding this blog and subscribe in order to seek advice on Basenjis, Mara was giving birth to her pups, with Fezzan around her and no one to supervise (so much for my calculations).
The good news is that everything went perfectly well. I went home after work and found Mara and Fezzan waiting for me at the backyard?s door. I noticed Mara's huge belly was gone so I ran to her crate and there they were, 5 perfectly healthy puppies (2 males and 3 females). All cleaned-up and sleeping. Just perfect.
It seems that Fezzan's presence during her giving birth did not affect Mara or the puppies. Fezzan seemed agitated, but in a positive way.
I did notice that every time Fezzan tried to get near the puppies Mara would growl so, as I should have known, nature takes care of situations like this.
I took Mara and the pups inside the house and stayed until 2 am around them, making sure all of them were fed.
There's a lot of work for me during the next weeks.
Thanks again.
Rodrigo