I’m shattered emotionally....

I'm sorry about the way you feel
As a former city mail carrier, I've had enough run ins with dogs, that I don't feel a bit bad about the dog.
We're dealing with a situation here with a neighbors dogs that aren't interested in keeping their dogs in check.
They have the attitude that we live in the country, and the dogs should be allowed to roam.
Their pitbull went after my grand daughter a couple weeks back, my german shepherd got between them and I'm dealing with vet bills.
All this coupled with the fact the animal shelter here is in flux with the county leadership, I have zero compassion for any dog that an owner can't/won't control.
I hope it works out for you, but don't be surprised if this doesn't end up in court.