My hunting/constant companion dog is the sweetest Dobe you're ever gonna find. I hear ya on dog attacks and sorry for your son.
But,if she came after you,good luck. I'm saying this not about Coco,but as a Dobe owner,and more importantly,an "understander". Their adrenaline,strength,and intelligence makes them especially dangerous. I'd say a 12g with buckshot would be the stopper. A handgun and you would have to be a really good shot and better be in a magnum loading which is gonna be tough to control. A bat? Would probably make the situation worse. Pepper spray? Maybe if you got a direct hit but,like a handgun.... you better be a good shot.
I'm not saying this as some puffed up Dobe owner, "my dog is so bada$$". Just some data points. I'm 5'10 and she can EASILY grab my throat. Also,am 200#'s and she can knock me down. She was the "runt" of the litter @80#.
Smartest dog I've ever been around,which is another aspect in the conversation.
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