Histiocytic SarcomaHistiocytoma, Benign FibrousHistiocytoma, Malignant FibrousHistiocytic Disorders, MalignantHistiocytomaSarcomaHistiocytesHyalinDog DiseasesSplenic NeoplasmsSarcoma, ExperimentalSoft Tissue NeoplasmsAntigens, Differentiation, MyelomonocyticDogsFatal OutcomeMuramidaseSarcoma, EwingImmunohistochemistrySarcoma, SynovialSarcoma, Kaposi