What essential information must be included in the patient’s medical record?

The correct answer emphasizes the comprehensive nature of a patient's medical record, which is vital for continuity of care and effective communication among veterinary staff. A complete medical record should include client information—the details of the pet owner—which is crucial for establishing treatment consent and contact. Patient history is also essential, as it encompasses previous medical issues, vaccinations, and treatments, helping veterinarians assess current health problems accurately.

Further, including treatment and progress notes is fundamental to track the patient's response to treatments and make necessary adjustments. This information ensures all veterinary practitioners involved can have insight into the pet's ongoing care, fostering better decision-making and outcomes.

While other options may mention certain components relevant to a patient's care, they overlook the necessity of a holistic view of patient management by omitting critical elements like treatment updates and client details.