Which information is NOT necessary on an anesthesia log?

An anesthesia log is a crucial document that helps ensure the safety and well-being of the animal during and after anesthesia. It typically includes information about the patient that is essential for monitoring and assessing their health throughout the procedure.

The animal's recovery status is vital since it provides insights into how well the animal responded to the anesthesia, allowing for appropriate post-anesthetic care. The veterinarian's license number is also important, as it identifies the professional responsible for the procedure and ensures that the anesthesia was administered by a qualified individual. Additionally, the name of the owner is necessary for record-keeping and ensuring proper communication regarding the animal’s care and treatment.

In contrast, while the animal's coloration markings may be useful for identification purposes, they are generally not critical to the anesthesia process or monitoring the animal's health. Therefore, such information does not need to be included in the anesthesia log, making it the least necessary component relative to the other choices.