Cats living in feral colonies that have been vaccinated and spayed / neutered are placed with businesses that need help controlling vermin. (vetlocator.com)
The first record of it was when archaeologists discovered the remains of Hatch, a rat - baiting dog, in 1982, Its speed made it highly suitable for controlling vermin. (platpets.com)
These scrappy little dogs were developed centuries ago to control vermin around human farms and settlements. (thehappypuppysite.com)