Feral dog packs are a nationwide issue. Just Google feral dog pack, feral dog attack (plural as well) etc. It is just another good reason to be armed at all times.Domestic dogs which have gone feral will congregate in packs. Some years back we had a pack of eight or so in the desert around Terlingua. Attacked deer, at least one horse, and threatened a hiker.
In the 1970s a pack near Georgetown, Texas, killed some of a friend's sheep. One of the dogs that he managed to kill had a collar with a tag; the owner lived only a very few miles away.
I've read of dog-pack problems more in Alabama than from any other state.