When I was younger, I had a pack of hunting dogs, sometimes one of them or all of them escaped sometimes for days and days, they were skilled hunters. Every time I brought them back home, they were healthy and had a full belly. I can even tell you stories of breeders who had a pregnant dog escape to give birth to puppies in the wild, inside a den. And stories of shepherds who shot a "wolf" who actually was a feral dog looking like a wolf. Primitive breeds, terriers, sighthounds are born wildlife killers, it's in their genetics, nothing like modern pet dogs.