A dog can only have one official pedigree.
A dog’s pedigree is a document that lists the dog’s ancestors. A pedigree usually lists three or four generations back, from the sire and dam, on through great great sires and dams. A pedigree is used by Kennel Clubs and Breed Clubs to ensure that the dog is, in fact, descended from dogs only of the claimed breed. This ensures the dog’s blood lines are ‘pure’ for a single breed. The pedigree that ensures a dog can show and breed world wide is one that is issued by an FCI Member Club, or a Kennel Club that has a Reciprocity Agreement with the FCI. If a dog has a pedigree from a non-FCI Member Club, that dog will have problems breeding and showing abroad. Dogs that have more than one pedigree, such as a Performance Pedigree issued by the UKC, have pedigrees most likely issued by kennel clubs not recognized by the FCI. UKC is not an FCI Member Club. These other pedigrees are not valid on the world stage and will not be recognized abroad. So when we say a dog can only have one official pedigree, we mean that the only pedigree that can be used for international purposes is one that is issued by an FCI Member Club. In order to get a pedigree, your dog’s sire and dam will both need to have their own pedigrees.
A dog can have multiple registrations.
A registration is very different from a Pedigree. A registration allows clubs of all types to register and track points and qualifying runs for a dog competing in conformation and sporting events. A registration will allow a Kennel or Sporting Club to track the number of dogs that are included in their database. Registrations contain no ancestry information about the dog. Your dog may have both a registration and a pedigree from the same club.
Dogs can have many registrations. Usually dogs have one registration for each club they are registered with. To obtain a registration, you will most likely have to fill out paper work with the respective club, and pay a fee, to receive the registration. Registrations are usually required for dogs participating in any type of dog sport, including Agility, Obedience, Go to Ground, Herding, Tracking, etc. Clubs that require dogs to have registrations with them include, but are not limited to, the Australian Shepherd Club of America (ASCA), the Jack Russel Terrier Club of America (JRTCA), United Kennel Club (UKC), National Association of Canine Scent Work (NACSW), etc. There are too many clubs to list on this page.