What is a veterinarian's responsibility when there is a change of ownership in an animal?

A veterinarian's responsibility when there is a change of ownership in an animal primarily involves the transfer of medical records to the new owner. This is crucial because the new owner needs access to the animal's medical history to make informed decisions regarding its care.

Transferring medical records appropriately ensures continuity of care and keeps the new owner informed about previous treatments, vaccinations, and any ongoing health issues the pet may have. It also fulfills the professional obligation to communicate effectively with clients while respecting the animal's health needs.

The other options are not aligned with best practices in veterinary care. Charging the new owner for previous treatments does not address the need for proper transfer of medical care responsibilities and could lead to confusion or dissatisfaction. Providing only a verbal history is insufficient, as it may lead to misunderstandings or incomplete information about the animal's health. Refusing to transfer records under the guise of protecting client confidentiality is contrary to the ethical requirement of ensuring that the new owner has the necessary information to care for the animal properly.

Overall, the correct choice reflects a veterinarian's commitment to responsible animal care and to facilitating a smooth transition of veterinary responsibilities to the new owner.