Stray dog Oscar needs surgery to remove a tumor

Oscar lived in the orphanage for more than 8 years. A year and a half ago, the volunteers noticed that his health had worsened. The examination revealed a neoplasm in the liver. Oscar had a successful operation to remove it. The dog moved to live on overexposure, where he successfully recovered. But recently, the guardian noticed a lump on his neck. The examination showed the absence of metastases, and Oscar underwent surgery to remove the neoplasm.