In this learning path, you will develop a practical, evidence-based approach to diagnosing, staging, and managing canine mast cell tumors (MCTs), with a strong emphasis on lymph node assessment. The course will cover how prognostic tools, such as the MCT prognostic panel, can assist in clinical decision-making and improve treatment planning. You will gain confidence in performing and interpreting lymph node cytology, helping you recognize both diagnostic findings and common pitfalls that may affect accuracy. Additionally, you will explore the increasing significance of lymph node mapping in primary care, including practical techniques for identifying and appropriately staging metastatic disease. Overall, these articles provide actionable strategies to enhance diagnostic precision, support treatment decisions, and ultimately improve patient outcomes in dogs with cutaneous neoplasms.