First of, your dog is gorgeous! Love those ears, and what a sweet expression! I am glad that you read the Pit Bulls and Dog Parks sticky, and are also drawing on your experience with your previous APBT. Each breed/type of dog has positives and negatives in their genetic make-up, be it health concerns or behavior traits. For the 'Bullies', DA is just a fact of life - and part of the management approach is to stay out of those dog parks FWIW: my male APBT 'turned on' at about three years of age, and picked our APBT female as his target - this happened without much of a warning. For the rest of her life, we separated the two. Note that prior to Trusty's 'turn', he had a very amicable relationship with Madeleine.