What information is not mandatory on medication labels?

The correct answer identifies that the medication's color is not a mandatory piece of information on medication labels. While it may be helpful for identification, it is not typically required by law or regulatory standards.

In veterinary practice, medication labels must include critical information that helps ensure the safe and effective use of the medication. This includes details such as the client's name, which helps tie the medication to the specific pet receiving treatment, and the veterinarian's name (DVM), which establishes a responsible party in case of any discrepancies or questions about the prescription. The date dispensed is also vital as it helps track the medication's validity and refills.

On the other hand, the color of the medication, while it might provide an extra layer of identification, does not impact the safe administration or understanding of the drug's purpose or dosage. Therefore, it is not deemed necessary to be included in mandatory label requirements.