About the "chicken agression", that was just a bit I remembered from Most's book about how a dog that had killed some chickens was corrected for not only agressive behavior, but also just looking at the chicken prompted a correction so that the association was made with "pain" and the dog learned that by not even looking, or pretending it wasn't there, the pain could be avoided. I haven't read an abundance on dog training as much as learning and behavior theory, so that was just what came to mind. I don't know for sure what today's common accepted methods are, except that everything seems to be motivational. Thought there might be something obvious to more experienced trainers that I'm not aware of.
I have about ten adults right now, some high drive, some aggressive in other focused ways. All of them have learned to coexist with the cat, either by ignoring it or engaging with it. This new pup is more extreme in his agression, and quite a new experience for me, but it makes me linger on Bob's comment about "bordering on tempermentally unsound" in the social agression thread. He's very smart, focused and obedient, so I won't worry too much.
In the past, training the dogs to deal with cats was sometimes challenging, the cat sometimes taunting, or making a game of chase from highground to highground. But in this instance the cat knows not to fool around with this one, and the only reason the two were that close together when the cat made the correction (probably two occasions) was because I couln't reach in time to redirect the pups attention. The pup is crated, I don't leave him alone with the cat.
I suppose I can recreate the scenario a few more times and he'll probably get it. It was just shocking to see him struggle so hard, despite the correction he underwent.