These are tumors that usually develop as deep, solid, masses next to the anal sacs. The susceptible dog breeds include German Shepherds, Older English Cocker Spaniels, Dachshunds, Springer Spaniels, Alaskan Malamutes, and dogs of mixed breeds. Development of the tumors causes compression of the rectum and constipation. A number of these tumors are linked to a disorder that is characterized by unusually elevated calcium levels in the blood. High calcium leads to increased water intake and urination, weight loss, and lack of appetite. The tumors frequently extend to local lymph nodes and other organs. A lot of cases require surgery, i.e. a removal of the tumor and tissues around it, together with affected lymph nodes. Radiation treatment and chemotherapy might also be recommended. However, very few dogs survive for more than a year following the diagnosis of this type of tumor.
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