Transmissible venereal tumor is a neoplasm of round cell plasmocitoide and linfocitoide aspect. The tumor present several particularities, for example, in the recent years has been evidenced a progressive increase of tumor with high percentages of aggressiveness and different response to chemotherapy, including resistance. Research this comportment to predict this behavior becomes important to aid decision as to the prognosis and management of the tumor before and during therapy. It is know that the use of the survivin, caspase-3, Ki67 and COX-2 are important to aid prognosis, the patient management and monitoring the tumor during and after therapy. This study aimed to identify differences in the expression of the above mentioned immunomarkers in TVT. For this purpose, the technique of immunocytochemistry on cytological preparations of 30 tumors of dogs examined at the Veterinary Hospital FMVZ-UNESP, Botucatu was used and the date analyzed by the spearman test (p<0,05). The survivin positivity ranged from 96.15 to 100% in 200 cells counted per sample, and its main cytoplasmic localization. The labeling by the anti-caspase-3 in 30 cases of TVT was low, ranging from 0 to 6.5% positivity in 200 cells counted. In 21 cases, it was observed by Ki-67 labeling, and there was an average of 15.57% positivity. Finally, in all cases there was expression of COX-2 with values ranging from 90.66 to 100% positivity in 200 cells counted, except for one case which showed 24.5% positivity. In conclusion, it is possible that the use of these markers in the TVT may assist in establishing a differential treatment, and we recommend, evaluate its expression compared with the type of response to therapy.