> You can't train this out of the dog, unfortunately.

Speaking from experience, I can say "Yes, you absolutely can train this out of a dog." However, it is not easy and it is only marginally more easy if you start at a young age of the dog. Furthermore, there are breeds that have no interest in chickens at all, anyway. LGD may actually even protect them.

Depends on the nature and breed of the dog too.

My GR goes into livestock guardian mode whenever the rabbits are free roaming in the garden (even though he's a bit scared of them ever since one bit him on the nose), but some dogs, terriers especially, will just instinctively chase and kill a rabbit.

I assume it's fairly similar with chickens.

Totally fair. Unfortunately this dog is a 4 years old black lab and we don't have the capacity to train him out of it. We manage it by keeping him indoors when we let the chickens free range in the yard.