The knowledge of lymphatic drainage has prognostic and surgical value for oncological treatment. Once you know the lymph nodes that drain the organ, you can predict the possible neoplasic cell route and avoid or predict metastasis. The lymphoscintigraphy is not common in Veterinary Nuclear Centers, however this technique has high applicability in oncological studies. During this study, the lymphoscintigraphie was used to characterize topological and functional aspects of lymphatic health mammary drainage in 30 adult mongrel female dogs, 10Kg in weigh. Lymphoscintigraphies were performed immediately after 4 intramammary peripapilare injections (0, 1 ml each) of 18,5 MBq of [^99mTc]-dextran70 and one hour later. Animals were imaged by lateral and ventral projections. Cranial thoracic glands were drained by ventral thoracic and axillary lymph centers, but we observed the simultaneous participation of superficial cervical lymph center in 40% of these (2 animals). This result was similar for caudal thoracic mammary glands, but not for cervical lymph center drainage, that was not observed in caudal thoracic glands lymphoscintigraphies. Cranial abdominal glands were drained exclusively by the axillary lymph center. Superficial and deep inguinal lymph centers drained caudal abdominal and inguinal mammary glands, but we observed one superficial cervical lymph center participation in a caudal abdominal mammary gland drainage. Our lymphoscintigraphic technique provided image of lymphatic communication between axillary lymph nodes and between superficial and deep inguinal lymph nodes. The number of lymph centers and lymph nodes, the lymph center drainage rate and functional behavior of each lymph nodes were variable. In conclusion, the lymphoscintigraphic protocol performed was simple, quickly and provided the lymphatic drainage characterization. Technique, topologic and functional information provided by the present study can be applied to understand neoplasic mammary cells dissemination routes, which has prognostic and treatment value for patients. Veterinary centers that have no Nuclear Medicine facilities can use these topologic and functional information of the present study in other diagnostic procedures such as the abdominal ultra-sound and lymph node biopsy of patients with mammary neoplasia.