A 12-year-old neutered male black Labrador retriever is presented with a three week history of limping on the right fore. The lateral digit is swollen and the nail is deviated ventrally, with ulceration of the nail bed. A lytic bone lesion of the 2nd phalanx is visible on a radiograph and cytology of the mass suggests neoplasia. Chest radiographs are clear. Following amputation of the digit, histopathology indicates that the mass is a squamous cell carcinoma. Which of the following is the best advice for the owner? 一只12岁的雄性已绝育黑色拉布拉多猎犬由于右前肢有3周的跛行史前来就诊。其侧指肿胀，指甲腹侧偏移，甲床溃烂。第2节指骨在x线片上可见溶骨性病变，肿块细胞学提示肿瘤。胸片正常。脚趾截肢后，组织病理学显示肿块为鳞状细胞癌。以下哪项是对主人最好的建议？