My father who was born in 1919 in Texas used to use similar dogs. His family bred bulldogs(pitbull type dogs ) and greyhounds. They used them on coyotes. The old man said the dogs would usually catch them within about 1/4 mile. Coyotes can really haul the mail when they want to so those were fast dogs. He said that the dogs would hit em at a run and throw them in the air . Breaking the coyotes neck.