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Salivary cancers are almost invariably malignant tumors originating from the secretory cells of the glands. Other swellings or tumors of salivary glands may be due to infections and cysts. The glands may also be swollen because of infiltrates of other cancers including those of fat, lymphoid, mast and melanocyte cells.

This tumor is a disordered and purposeless overgrowth of sebaceous gland cells. These glands are attached to the hair follicles where their function is to lubricate the hairs and skin. Almost all sebaceous gland tumors are benign and can be permanently cured by total surgical removal. Many are multiple. Malignant tumors, which have the potential to spread to other parts of the body, are extremely rare.

Lymphocytes are key cells in the body’s ability to fight and prevent infection (’immunity’). Lymphocytes are found in tissues throughout the body, in the blood and in particular concentration in lymph nodes (’lymph glands’) and other ’lymphoid tissue’. Lymphocytes are of two main types, called ’T’ lymphocytes and ’B’ lymphocytes. Each plays a different role in immunity.

This is a malignant tumor of skin epidermal cells with varying degrees of differentiation. Tumors of this type occur in people and all domestic species. The tumor is related to basal cell tumors. Most can be cured surgically, the exception being those arising in the nail beds. 

Tumors of the epithelial, glandular stomach lining include non-cancerous polyps and some types of chronic (hyperplastic) gastritis. Malignant epithelial tumors (gastric adenocarcinomas) cause progressive illness. This usually starts only a few weeks before diagnosis but within that time, they have usually spread locally and to distant organs. Many recur following surgery. 

This tumor is a disordered and purposeless overgrowth of sweat gland cells. Most sweat glands are attached to the hair follicles (paratrichial) but a few are not associated with follicles (atrichial). Most sweat gland tumors are benign and can be permanently cured by total surgical removal. Malignant tumors that spread to other parts of the body are rare.

Of all the compelling reasons to quit smoking, this one should make dog lovers sit up and take notice: there’s ample scientific evidence to suggest secondhand smoke can cause cancer in companion animals.

This is a tumor originating from the connective tissue of, or beneath, the skin. The tumor is diverse in appearance and several different cell lines produce tumors of similar appearance. Some pathologists try to classify this group of tumors by their origin cells but this is not always possible. There are therefore several names that can be used for the tumors of this group including fibrosarcoma, Schwannoma, peripheral nerve sheath tumor, neurofibroma and haemangiopericytoma. Most are slow-growing and few have fibrocyte markers. The tumors often recur locally after surgical removal but spread to other parts of the body (metastasis) is rare.