I see. I would not want wildlife to be hurt.
There are several threads on here that explain how to bear proof that you will find helpful.
Keep us posted on how things turn out.
Just a thought. Would it be better to hot wire your fence to keep the dogs out in the first place? You said they were digging under. I would zap their A$$ before they made it into my yard. Just sayin.
Wow, oh wow. I'm so sorry. That is devastating when you did everything you could to keep them safe.
Don't give up on chicken keeping, we can see how much you loved and cared for them.
When you build back , use hot wire like those that have bears do.
I would price your hens for adult hens...