The veterinarian-client-patient relationship (VCPR) is the basis for interaction among veterinarians, their clients, and their patients and is critical to the health of an animal. Any Veterinary Feed Directive (VFD) Order must be issued by a licensed veterinarian within a valid VCPR.
Federal regulations (21 CFR §558.6 (b)(1)) require that a VFD is issued in compliance with the VCPR as defined by the State. For states that do not define key elements of a valid VCPR, the VFD must be issued in compliance with elements of the federally-defined VCPR (21 CFR §530.3(i)). The FDA Center for Veterinary Medicine maintains a list of states that require a state-defined or federally-defined VCPR in order to issue a VFD.View the AVMA's definition of the VCPR.