What is Breast Cancer? Abnormal replication of the cells that make up the breast tissue results in a mammary tumor, also known as breast cancer. Mammary tumors can be benign (non-cancerous) or malignant (cancerous). While there is a higher tendency for female dogs and cats to develop breast cancer, there are cases where male dogs and cats develop breast cancer as well. Statistics show that in dogs, 50% of these tumors are benign. Of the 50% that are malignant, half of them can be removed completely, resulting in your pet getting cured. The other half will either recur or spread to other parts of the body following surgery. Whereas in cats, the picture is grimmer: approximately 86% are malignant. Signs and Symptoms A mass…