Canine Mammary Cancer

Mammary cancer is the most common type of cancer affecting unspayed female dogs. It often occurs in female canines between five and 10 years of age, but can be found in dogs as young as two and in rare cases, male dogs. It is estimated that approximately one out of every four unspayed female dogs over the age of four will develop mammary cancer.

  1. Types

    • There are several different types of tumors that can occur in the mammary glands. Common malignant tumors include anaplastic carcinoma, papillary adenocarcinomas and malignant mixed tumors.

    Symptoms

    • Often, the only symptom of canine mammary cancer are the solid masses felt beneath the skin. These masses may be swollen or they may bleed or ulcerate.

    Diagnosis

    • Many tests will be run to confirm a diagnosis of canine mammary cancer. These tests can include a physical exam, blood tests, ultrasounds and a biopsy of the affected tissue.

    Treatment

    • Mammary tumors in dogs are usually removed surgically. The dog may also undergo chemotherapy or radiation therapy to kill off any remaining cancer cells.

    Prevention

    • It is estimated that female dogs who are spayed before going into their first heat will have a less than one-percent chance of developing mammary cancer. By spaying the dog it is possible to almost completely prevent mammary tumors from forming.