All the breeds or standards in our database (PRT-KC/FCI/AKC or JRT-JRTCGB or JRT-ANKC/FCI) have overlappings in their history. For example you can find the same "Tarsia" or "Foxwarren" dogs as ancestors in each of these breeds or standards. Furthermore in many national Kennel Clubs or other Breeding Clubs, there are dissimilar ways to differentiate between this breeds or standards. Finally many breeders are enthusiasts of both JRT and PRT.