Diagnosis starts at home with noticeable swollen mammary glands or a solid swollen mass. These masses could be as small as pea sized and will probably be hard to the touch and difficult to move under the skin. Some mammary masses could be larger, spreading across the abdomen. Because the diagnosis of tumor type is necessary, a biopsy will be performed by the veterinarian to determine if the tumors are malignant or benign. Depending on your veterinarian’s preference, a needle aspirate might be requested to diagnose and determine if the tumors are benign or malignant. Some veterinarians may perform the biopsy after surgery, depending on the aggressive behaviors of the tumors. A chest x-ray might also be needed to assist in determining the position and size of tumors. Moreover, a full panel Complete Blood Count (CBC) will help in diagnosing as well. A CBC will evaluate and measure the cells circulating in the dog’s blood.
Radical mastectomy involves the full removal of tumors and well as mammary tissue and the surrounding lymph nodes. Unlike the breast tissue in a human, mammary glands in dogs are just under the surface of their skin, not under the layers of muscles. For this surgery, the mammary tissue, as well as the skin covering the breast tissue and the four lymph nodes surrounding the mammaries, will all be removed.
Though radical mastectomy is a surgery requiring anesthesia and recovery time, it is not as invasive as mastectomy surgeries in humans. Because anesthesia will be necessary, the dog will have to fast before surgery, usually overnight. It will be imperative the dog be kept calm and quiet for a few days post surgery. A cone or very loose fitting T-shirt will help in keeping the dog from irritating the incisions. Suture removal is usually 10 to 14 days after surgery. At this point, the dog should be able to return to regular activity.
Some dogs, if not spayed already, will be spayed during surgery as well to assist in future tumor prevention.