Hahaha that’s actually kinda funny, I do feel bad for your nephew though (sorry.. :P) but that could be it… I mean another thing that i forgot to mention is that although pitbulls are known to be dog aggressive my Kiba has a halfway point. Like she LOVES to play with any dog or cat that wants to play with her but if they don’t, it’s like she senses something and starts to want to attack. So it could be that she senses this in men too, like it could just be with particular men. She likes my brother but not my dad, she likes my father-in-law but not some friends… hmm I think we got something here… but i still wish to neutralize the behavior to where she is at least tolerant