Yes, Continental Kennel Club does accept registration papers from other kennel clubs. Please see the list below.

American Border Collie Association

American Bulldog Association

American Bulldog Registry & Archives

American Canine Association (ACA)

American Dog Breeders Association (ADBA)

American Field Dog Registry

American Kennel Club (AKC)

American Pet Registry (APR or APRI)

Anatolian Shepherd Dog Club of America

Animal Research Foundation

Australian Shepherd Kennel Club of America

Boykin Spaniel Society

Canadian Kennel Club

Federation Cynological International (FCI)

Jack Russell Terrier Club of American (JRTCA)

Miniature Australian Shepherd Club of America

National Greyhound Association

National Kennel Club (NKC)

National Stock Dog Registry

The Kennel Club

United Canine Association

United Kennel Club (UKC)

Universal Kennel Club

World Wide Kennel Club

This is not an exhaustive list. Registration papers from most national registries of other countries are also accepted by Continental Kennel Club.