In this video we discuss what to do if you notice your dog or cat has a lump. We discuss that there are many different causes of lumps (from insect bites and cysts to cancer), and we explain that it is important to obtain a biopsy of the lump (like an FNA or fine needle aspirate) to understand what it is. We talk about what cancer is, and how it can spread (or metastasize) to other parts of the body if too much time elapses before it is diagnosed. We also provide other tips to ensure that your pet receives medical care in a timely manner, before it is too late.