Pelt melanoma covers a broad group of cancers that covers any uncontrolled growth of cells of the skin or linked structures such as glands, hair follicles and supportive tissues. Metastasis to the pelt from melanomas elsewhere in the body can take place but these are not thought of as pelt tumors since they did not begin in the skin so not skin cancer in dogs.
The skin is the largely frequent site of cancer in the dog and the second largely general site of melanoma in the cat. Canines have up to six times the amount of skin tumors as cats; nevertheless, skin growths in dogs are more likely to be non-malignant than those in cats. Skin cancer in dogs often occurs in canines that are six to 14 years old, although there are numerous types of skin cancers that take place in young animals.
Breeds of dogs that have been noted to have a greater incidence of pelt tumor comprise boxers, Scottish terriers, bull mastiffs, Basset hounds, Weimaraners, Kerry blue terriers and Norwegian elkhounds.
The cause of most pelt cancers is unknown. Exposure to the sun has been shown to make a higher rate of two types of pelt tumor: squamous cell cancer and hemangioma. Fair-haired dogs with thin fur that stay in sunlight too long have a greater chance of developing either squamous cell cancer or hemangioma. There may be a heritable basis for the growth of some tumors.
Skin tumors may be divided into four categories, depending upon the cell style that is involved. These groups are epithelial tumors, mesenchymal cancers, round cell tumors and melanomas.
• Epithelial tumors. These cancers comprise the pelt itself, glands in the skin or the hair follicles.
• Mesenchymal cancers. These growths are derived from cells that enclose or support the pelt like fat, connective tissue
, blood vessels and nerves.
• Round cell cancers. These tumors are so named due to their look beneath the microscope and include lymphosarcoma, mast cell tumors, histiocytomas, plasma cell cancers and transmissable venereal cancers.
• Melanomas. These melanomas come from melanocytes – cells that supply pigment in the pelt.
In dogs, the largely general melanomas are lipomas, mast cell growths, oil gland adenomas/hyperplasia and papillomas. Most pelt tumors appear as a protuberance in or beneath the skin or as a eruption that does not heal. Animals with skin cancer may feel discomfort or itchiness because of the cancer. This may cause them to chew or rub at the affected region. With some sorts of tumor, there may also be reddishness to the pelt or it may have a blistering look.