These are the only 2 Kennels on the Internet that I recommend if you are looking for Sportbred dogs. These men have the real deal in Sport Blood. They breed for quality and not just because the dog is from the same bloodline. If they breed to it then you can bank on it being an attempt at bettering the breed and bloodline.
Doug Cox is the man that started the Sport Line. He has a daughter of Sport named Doll that is a UKC Squirrel Champion . Doll is a littermate to Britches. He has several granddaughters of Sport in his kennel.
http://oakdalekennel.tripod.com/index.html
Randy Walters owns a full brother to Britches named Tombigbee Taz. Taz is an NKC Squirrel Champion. Taz is an excellent dog and places in all of the ATFA hunts. He also owns Gizmo. She is a daughter of Sport and one heck of a dog. Randy has owned a good many dogs out of Sport. He has several other Sportline dogs.
http://home.bellsouth.net/p/s/community.dll?ep=16&groupid=352122&ck=