pitbull inbreeding

Question
around this time last year my rednose red nose got pregnant and gave birth to a litter of 16 and out of that
16 i kept a boy to raise with her. so mother and son are raised together then one day i walk downstairs and they're stuck he was about  8 months at the time and they had sex... are the dogs going to be okay or is there going to be a problem because they're inbred? or because he was too young to have sex?

Answer
Hi Cerise

The male can produce viable semen as young as 6 months old.

The Pitbull is the most interbred breed in history.  If you know anything about their history  you know that only the best made it to the breeding stage.  

There are a number of problems with that much inbreeding is foremost is that anything inherent in the lines are going to come out 10 fold in the pups.  The pups will be more hyper and have more drive, smaller size, inbred depression and much more.  

And added to that your dam hasn't had enough time phyiscally to recover from raising 16 pups.  Her diet will have to be supplemented with vitamins, oils and high protein and fats.