How about fixing your coop first so the chickens don't escape anymore.
Try railroad ties on the ground or laying wire mesh on the ground and slipping it under the coop perimeter, so both inside and outside have wire on the ground that will prevent hens from digging out or dogs digging in; cover it with dirt. Weigh down with large rocks or pound it into the ground with staples.
Problem solved.
Unless the mods deleted them, somewhere in this forum maze are posts I put up a year ago or so, to extensive training articles in Backyard Poultry Magazine and Countryside, on how to train LGDs on fowl that I wrote.
Keep in mind they were written for real LGD breeds, not non-LGD breeds.
Hunting breeds, breeds with prey drive, cannot be trusted to leave poultry alone and the likelihood of training older non-LGD breeds to suddenly accept fowl and guard them instead of chasing or eating them, is faint at best. Some have done it, but usually most don't or can't.
Either way, any dog expected to "be nice" around your poultry, requires extensive hands on training and encouragement and correction from their owners. This is not a "sit on the back porch and watch the dog chase hens then complain about it" deal guys. You have to participate. Fully. Daily. Several times a day.
Which is why so many people figure out (with their non-LGD breeds) it is more painless to just build a solid coop and foraging area for their birds that keeps them separate from their canines.
