Canine Cancer Secrets - Types Of Breast Cancer
Dog breast cancer or mammary cancer is
a fairly common cancer and is now
known as the number one natural cause
of death in older and unspayed female
dogs. Like in most cancer sites, there are
several types of breast cancer.
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1. Carcinoma in situ – Breast cancer often starts at ducts
and lobules. If the abnormal cells have not yet spread to
other parts of the breast and has only remained at the root
location, it is termed as carcinoma in situ.
2. Ductal carcinoma in situ (DCIS) – Ductal carcinoma in situ
is the most common form of non-invasive breast cancer and
the most curable. It occurs when cancer cells remain in the
ducts and do not affect the fatty tissues that surround the
breast.
3. Lobular carcinoma in situ (LCIS) – Lobular carcinoma in
situ occurs when the milk-producing glands of the body do
not get through the lobule walls. It is not really breast
cancer in the strictest sense, but this condition can increase
the risk for breast cancer development later in life.
4. Infiltrating (invasive) ductal carcinoma (IDC) – About
eighty percent of all invasive breast cancer cases is
infiltrating ductal carcinoma, thus, it is the most common
form of breast cancer. In this type of breast cancer,
cancerous cells start in the milk passages, go through the
milk ducts, and spread to other parts of the breast.
5. Infiltrating (invasive) lobular carcinoma (ILC) – In
infiltrating lobular carcinoma, cancerous cells start at the

lobules instead of the ducts. This type of cancer can also
invade other cells in other parts of the body by going
through the passages. Only ten percent of the invasive
breast cancer cases is infiltrating lobular carcinoma.
Mammary tumors in dogs are less aggressive than those of
cats. But then again, dog-owners should watch out for the
signs and symptoms of canine cancer, for the early diagnosis
and treatment of the different types of breast cancer.