Under which condition may a veterinarian dispense a prescription-only drug that is not in a child-proof container?

The correct answer is based on specific regulations regarding the dispensing of prescription-only drugs. In Arizona, there is an allowance for veterinary prescriptions to be dispensed in non-child-proof containers if certain conditions are met, one of which includes the packaging size. When the amount of the drug is more than 4 ounces and provided in bulk, it is permissible to dispense it in a non-child-resistant container. This regulation is likely based on the practicality of managing larger volumes of medication, where a child-proof requirement may not only be impractical but also cause issues for the owner in administering the medication to their animal.

This specific condition emphasizes the importance of understanding the regulatory framework around veterinary practice in Arizona, including maintaining safe practices while also accommodating the needs of both the animals receiving medication and their owners.