Sounds awful Shane'o.
sounds also like your spending a LOT of energy, on things you have no control over.
Suck it up. It'll be less stressful for all.
A 6ft high, by ? long tennis court type fence enclosure can be purchased on line, in kit form and delivered. Or, DIY, take a look at the designs on line, and copy it.
collars are dirt cheap. if you make a sheath to go over a ordinary collar.
And your dog can go in/out, providing when its 'out' it can get beyond the secure enclosure.
I think a dog that lives rurally, and has attacked livestock is dangerous, until its managed by fences or a gun