 At the same time, the JRTCA discouraged inbreeding and eventually restricted line breeding to a set percentage.To balance off an open-registry with the desire to keep Jack Russell-type dogs looking like Jack Russells, the JRTCA decided not to allow dogs to be registered at birth or to register entire litters.Instead, each adult dog would be photographed from both sides and the front, with each dog admitted to the registry on its own merit.