Canine ovarian tumors of germ cell origin.

Fourteen ovarian germ cell tumors were diagnosed in the dog--seven dysgerminomas and seven teratomas. Six of the teratomas had immature components and were judged malignant; three had metastasized. One dysgerminoma had metastasized. The dysgerminomas developed in dogs ten years of age and older, and the teratomas developed in dogs nine years old and younger.