Overview of Canine Mammary Tumors

Canine mammary tumors are most commonly found in female dogs that have not been spayed.  Development mainly occurs in dogs between five to ten years of age. Therefore, spaying tremendously reduces the risk of a female dog developing mammary tumors.  Some breeds are at a higher risk for developing tumors of the mammary glands than others.  German shepherds, spaniels, and toy or miniature poodles seem to be the most susceptible.   

The recommended treatment is usually surgical removal of the mass.  The exception to the rule is older dogs that are deemed unable to survive a surgical procedure.  In some cases, the dog is spayed at the same time to prevent a recurrence of mammary tumors.  Canine mammary tumors result in approximately 50% benign and 50% malignant.  Tumors can develop as a single tumor or as a chain of tumors. 

Early detection and immediate treatment while the tumor is still in the early stages, offers the best opportunity for a successful recovery.     

Pet owners should examine their dogs regularly for any unusual lumps or swellings.  Anything out of the ordinary should be brought to the attention of the dog’s veterinarian.