Round cell tumors are among the most common skin tumors in dogs, and they typically form just under the skin, although they may change the surface of the skin above them. It is impossible to diagnose any of them without a veterinary pathologist analyzing a tissue sample of the tumor under a microscope. If detected early, most round cell tumors can be easily removed.

Radiation is a type of energy produced naturally by the sun, earth, and rocks and artificially by machines. Although several types of tumors can be treated with radiation therapy alone (e.g., nasal tumors, brain tumors, and certain types of lymphoma), radiation therapy is most commonly used to destroy or limit the growth of cancer cells left behind (i.e., microscopic disease) after a tumor has been surgically removed. Side effects depend on the type and location of the tumor and its surrounding tissues.

Tumors of the prostate are relatively uncommon in dogs and extremely rare in cats. Clinical signs include bloody urine, or straining to urinate or defecate. Metastasis to the pelvic bone and/or lumbar spine is likely. Diagnosis and treatment options are discussed. Prognosis is considered poor.

The American Animal Hospital Association and American Veterinary Medical Association have established guidelines to standardize preventive health care for dogs, helping them to live longer, healthier lives. This handout provides an overview of the recommendations within these guidelines and why they are so important.