The rough/broken coats come from other terriers that were bred into the Jack Russel/Fox Terrier line over the years. They are the best but people always ask what kind of dogs. They are not very well known. One of my long coated ones is a super mouser, all he wants to do is hunt. The short haired typical looking Jack is a talented ball player and defiantly more high strung than the long coats. Yesterday at the vet clinic I saw a precious dog that would pass for a broken coated Jack. She was a Chihuahua West Highland Terrier cross. I could have stolen that dog! :D