Even though you won't have material assets to show for it, it might turn out to be money well spent.
In my state, if the dog is on my property and has harmed my animals, it is toast. Doubly so if it is trying to return later. Same if the dog is on my property and displays aggression toward any person. This dog was damned several times over.
I have talked to the owner. I had left note, demanded compensation, she called me today, and we agreed on a bit under half. It should at least cover the direct costs of raising the chicks to adulthood.