Articles about American Pit Bull Terrier
Absolutely. Some people have trained their bulldogs to release without correcting them in any physical way. One should remember that a bulldog has a hunting/baiting/fighting heritage. The uglier the battle is, the more zoned the dog has to become to survive. Pain must be met with harder struggle.
Starting With Pup
Training the release is going to be done with positive reinforcement, along the lines of pavlovian conditioning, and the earlier we can start, the better. Six weeks is not too young.