Mountain Curs and Blackmouth Curs are great small game hunters and ratters. Good guard dogs too. For pure unrelenting prey drive though, you can’t beat a Jack Russell. Absolutely fearless when after something. My son used to make good money when he was a teenager going to peoples barns and cleaning out the vermin. It was nothing for a pair of Jacks to drag a hundred or more mice and rats out of a barn.
I miss my old Jack Russell so much even after 4 years. A Jack will always be my “heart” dog. My Feists have enough Jack in them to be the same way.
Mountain Curs have the size to be formidable.