Bite inhibition is taught by the owner. You can never start too early with training even if it is for very short periods of time every day. The barking can be the cause of boredom. There are many topics on housetraining here. You can't take the dog outside to play and poop. When you go outside with her, you need to get her to focus on pottying, not playing. A strict schedule for housetraining is a must. Everyone is different but I can't stand when people refer to APBT's as pitties or pibbles.