This page includes a link for online reporting.
"Veterinary report of a caesarean operation on a dog and/or a procedure altering the natural conformation of a dog
The owner of all dogs registered with the Kennel Club give their consent to the reporting of the following: [(1) any caesarean operation, and/or] (2) any operative procedure carried out by a veterinary surgeon on a dog which alters its natural conformation.
Veterinary surgeons carrying out such procedures are therefore asked to complete the following form (to the best of their knowledge) and submit online."
Also see the Kennel Club's resources for : veterinary practices and researchers