Eyelid tumors are very common in dogs and can become quite large. Fortunately, approximately 90% of these masses tend to be benign, meaning they do not spread to other parts of the body. If the tumor becomes large or causes secondary irritation, surgery to remove the mass is likely indicated. Depending on the size of the mass and its appearance, several surgical options are available. Small masses can usually be removed using local anesthesia and cryotherapy (freezing). An example of this procedure is shown in the photos below.  Larger, or more invasive appearing masses are usually removed through the completion of a wedge resection or more involved blepharoplastic procedure.