When I first started with doing the chicken thing, my dogs, Sassy and Luna, killed five 3 month old hens and 2 guineas. We were devastated but we started over only this time we went with full grown chickens. For about 3 months I would allow the dogs out onto the porch where they were confined. They could see the chickens, watch the chickens but not get the chickens. One day, Luna was accidentally let off the porch and the chickens out. No problem but for about a month we kept a very close eye on everybody when they were out together. We have had problems with Luna going after chicks but finally came to realize that was because Luna is a toy girl, she likes her stuffed animals with squeaky things inside of them. We realize the squeaky toys sounded a lot like baby chicks. Now when picking out dog toys I check the sound carefully.
Were my dogs punished? Yes. Were they beat? No. But with patience and training everyone can live together in peace.
I'm sorry for your loss.