EN
On the surface of the skin of a dog aged 9 months some noduli of different size were found. They were painless, of compact consistency, movable in relation to the base and immobile in regards to the skin. Haematological examinations revealed an increased amount of lymphocytes up to 44 per cent, a decreased number of neutrocytes (up to 35 per cent) and the appearance of mononuclear and blastic cells, as well as myelocytes. Histopathological examinations showed the infiltration of dermis and subdermis layers with cells of the lymphoblast type. It was found that the changes were caused by lymphosarcoma which is relatively rarely met in dogs.