[MIBgirlsXXL]

Seems like he just need to be socialized gradually. Normally DA dogs if they will really attack.. their body becomes stiff like a rock, they will not wag their tail too much and if you pay close attention.. they are licking their lips as if they want to eat (well that's with apbt). If their hair rise up in a scarecrow stance as I call it they will just scare away and will avoid fight.

What I normally do with that situation is I'll hold him on a leash on one hand and I'll pet another dog then after a minute I'll pet him back. If he's wagging tail and barking.. most likely he just want to play. So I'll slowly bring him over to the other dog on a leash