The effectiveness of two different methods for the treatment of mammary tumors in bitches was examined in 30 dogs to determine the use of homepathy induction by Phytolacca $D_{2}$ preparations. The animals in group 1 received only Phytolacca $D_{2}$. In group 2the tumors were removed surgically and were treated with Phytolacca $D_{2}$ post operation. For the clinical sigh post treatment the dogs were examined regularly to detect neoplasia, reoccurrences and metastases. Treatment with Phytolacca $D_{2}$ resulted in following effects; In group 1 was not efficient. In group 2 was an inhibition of tumor growth and treated animals appeared to be revitalized.