It is true obedience training can suffer extinction. Only, however, if you were to take yourself out of the picture permanently also. Positive reinforcement as little as every few weeks can help to reinforce the training. Do no harm.
Having dogs & working at a dog training facility has shown me more times than I can count that dogs learn obedience only through consistent training. If it is not consistent, a dog will learn only that he can get away with the bad behavior *sometimes*. If the reward for the bad behavior is "worth it" to the dog, he will continue to attempt the behavior for the few times he does get away with it.
For the chickens, that's bad news & a life of stress from a predator. For the dog, it's confusing & he gets yelled at & punished a lot. Trust me on this. Consistency is the key. Once the behavior is truly learned, intermittent reinforcement is enough. An electrified fence is a consistent behavior modification tool, not a way to do harm.
Also, anyone who suggests to shoot someone's dog before getting a fence is, IMHO, wrong. Sorry...just my opinion. The dog should not be executed for it owner's shortcomings. There are other effective ways to keep the peace & do no harm.
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