4 to 6 is a low amount. You can have only 1 in a litter but that is rare.
2 or 3
When you have a real pitbull line, the dog comes out game. You don't even have to test fight your dog to know that. For example, if you mix a Colby with a Cooper, even if you don't have papers, the pups will come out game. If you mix a dog that has many bloodlines in his veins and a bith with a mix of many bloodlines in her veins, the pups will come out game. Botom line is that a real pitbull with a real pitbull no matter the bloodline will breed game dogs.
You can breed any kind of dog. What you want are results. Anyway you will get nice and tough looking pups but those are not Pit bull. You will get what they call a bully.
Litter
Get a real pitbull female dog and the rest of the work is done by them.
Usually a father dog does not know his pups
You can breed any dog with another dog.
American pitbull terrier
pitbull is stronger than k9
pitbull
the dog will just have finishined weening of pups but cant have them straight away as it it is to much strain on the dog and you should wait at least 10 months for the dog to get used to everything again. maybe a little longer as a dog is only pregnant for a short time
Your gonna have to feed the pups yourself if you don't your pups will die. If the dogs breast are swollen then your dog is sick.