Abstract
Skin tumors are some of the more common neoplasms in veterinary medicine and probably the single most common histopathology specimen sent to diagnostic laboratories. In this chapter the tumors have been classified using the International Histological Classification of Epithelial and Melanocytic Tumors of the Skin of Domestic Animals, but with modifications and additions where appropriate. In the appendix on Canine breed predispositions for epidermal and melanocytic tumors, the chapter provides a table of breeds that are predisposed to developing epidermal or melanocytic tumors that have an odds ratio >3.0 along with the 95% CL levels and p‐values. There are several breeds with high odds ratios that are well documented to be predisposed to developing specific epithelial neoplasms. Basal cell neoplasms are epithelial neoplasms which show no epidermal or adnexal differentiation. Squamous cell carcinoma (SCC) is a malignant neoplasm of epidermal cells in which the cells show differentiation to keratinocytes.