Cute pup, but I'm really hoping that she's ok. My sister-in-law lost her pup to parvo, as did much of the litter she came from. I agree with envy that she was very long to be removed from her mother, so that will mean more work for you.
My first pup was a bitter, but we trained it out in about a month. Every time she would bit at us (envy is right whether it hurts or not) we would grab her snout shut. And she hated that, so she evenually figured out the direct relationship between her bitting and the snout getting held shut. She's never bit since and she's almost 4. No hitting required or anything like that.
I'll stay out of the pit bull debate, I have my thoughts. For dogs in general, the way they are brought up has a great deal to do with behavior and all dogs have different personalities, but pit bulls are natually guardian type dogs so their instincts are to protect. There are specific ways to control and train dogs with these instincts. As long as you know your dog and what situations are ok for them to be in and which ones to avoid I'm sure she'll be a great dog for you.
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