ID Dog breed Age Primary mammary tumour Metastases  at  post-mortem examination O 389 Boxer Not Combined The lungs     known Osteosarcoma         (L5)*)   117 Giant 11 Spindle cell tumour The lungs   Schnauzer years (R4)*)         Combined         osteosarcoma (R5)   143 Airedale terrier 11 Combined The mediastinallnn**), lungs,     years osteosarcoma (L5) myocardium and kidneys 144 Giant 11 Combined The    sternal lnn,    lungs,   Schnauzer years osteosarcoma (L5) pericardium, myocardium,         pleura, diaphragm, spleen and         kidneys   353 Papillion 15 Combined The lungs and kidneys     years osteosarcoma (R1)

*) Tumour location: L = left side and R = right side, numbered from the cranial to the caudal mammary glands (1-5); **) Lnn = lymph nodes

Table 1: Data of the dogs and tumours included in the study.