When I first got chickens, a couple of my dogs were already grown. I exposed them to the chickens a lot, supervised, and the chickens are just a part of the landscape here. I played with the dogs amoung the chickens. And if they ever chased or were interested in the chickens, I'd yell "no" and they'd stop. Now they free range among the dogs, I don't even watch them.
The puppies need to be trained not to chase chickens. Again, I did "NO" and lead corrections.
If your dog doesn't respond to verbal commands, I'd highly recommend a remote controlled shock collar and zap them along with NO!! when they are interested in the chickens. They need to understand that the chickens are YOURS and not theirs, and that they're off limits.
My dogs haven't gone and after chickens or guineas and have been left alone in the house with chicks and keets, have been in the henhouse and pen, have played fetch and wrestled with each other in the company of the chickens, have been forgotten outside when leftovers were thrown to the chickens, etc.
I really believe that MOST dogs, unless really badly prey driven, can be TRAINED with consistency. Most dogs want to please you. They really respond well to treats and praise. The shock collars are invaluable if you can't do leash corrections. If they chickens and guineas bore your dogs, they'll ignore them. I have more trouble with my dogs "stealing" shoes, tools and clothing off the porch than messing with the other animals.
I'd never beat a dog with a dead chicken...or tie it around it's neck to decompose, I don't see the rationale in doing that. For my dogs, that would have made it worse. I'd rather give it a good shakedown (like it's mother would) because they understand that.