Tumor types: There has been a long-lasting debate about classification of canine mammary tumors. According to the World Health Organization (WHO), canine mammary tumors are histologically classified into four categories: malignant tumors, benign tumors, unclassified tumors, and mammary hyperplasias/dysplasias.
Gandy dancer is a slang term used for early railroad workers who laid and maintained railroad tracks in the years before the work was done by machines.
In the 1920s, gandy dancer was applied to a petty crook. There is likely to be a link. It is probable that a gandy dancer at this period was a casual labourer, seasonally employed, who might very well have been a hobo or tramp for the rest of the year. This is supported by the term turning up several times in the 1920s in glossaries of hobo and tramp slang.