First, unless you already have a bad relationship with the neighbor, talk to them. Tell them what happened and your concerns about them keeping their dog in their yard and out of yours. Since the yard was fenced, they likely thought their dog was contained. And it WAS, until the dog dug out. The concern now is that the dog thinks it was rewarded by digging out, and will almost certainly make repeat attempts.
Your first request to the neighbor is to have them make strong repairs to the fence post and wiring. Second is to find a way to keep the dog from digging out. Third is for reimbursement for your loss.
If the neighbor is unwilling to be neighborly, that is when you need to call the appropriate authorities in your area.
Your first request to the neighbor is to have them make strong repairs to the fence post and wiring. Second is to find a way to keep the dog from digging out. Third is for reimbursement for your loss.
If the neighbor is unwilling to be neighborly, that is when you need to call the appropriate authorities in your area.