Canine mast cell tumors (MCT) are the most common skin malignancy in dogs and can present a range of challenges for veterinarians. With a wide range of biologic behavior and outcomes, as well as a variety of diagnostic tests, prognostic factors, and treatment options, it can be overwhelming to manage MCT in practice. Join Dr. Sue Ettinger for an in-depth look at the diagnosis and treatment of canine mast cell tumors. This lecture will provide a concise overview of the latest updates in MCT diagnosis and treatment, including cytologic grading, staging recommendations, surgical margins updates, and the use of intratumoral Stelfonta. We'll cover essential diagnostics, treatment options, supportive care options, and prognosis. Don't miss this opportunity to get up to date on the management of canine mast cell tumors.