This thread has my interest as we have been dealing with the devil dogs for a few years. We live on the NC coast in a small drinking village with a fishing problem, 15 years ago the county had a feral cat problem today none. It was common to hear of 3-5 pets or ferals to get gone weekly and at times nightly.
Our county allows for 24/7/365 with NV and suppressed if you have it as does 95 out of 100 counties in NC. The remaining 5 counties are involved with Red Wolf hybrids and tree huggers. Most all hunt clubs have a shoot on sight policies.
My latest run in went down as I was giving RJ (my 5 yo Carolina Dingo Dog) his last property patrol before lights out. We exit the cottage and RJ bolts towards the pond, I sweep him with my light to see his target is a large yote. So RJ being the super dog that he thinks he is bolts right in behind the bait yote. By the time I get to the area where he left the yard he comes trotting out with 2 yotes in tow, the first dove back into the woods when I racked the slide, the second continued straight towards us with her nose on the ground. This is with a Streamlite on her face, at 20 yards i planted her.
This happened so fast that there would have been no saving the dog if I was not there and armed. Funny side was the wife coming out wanting to know what the yelling and gun shot was all about.
OP, sorry for your loss, I can fully understand your anger.