Epithelial tumors are those that develop and involve the glands in the skin (sebaceous glands), the skin particularly, and even the follicles in the hair.
There are also tumors that seem to be round or globular when examined closely. These are called round cell tumors, and are microscopic. Examples of these types of tumors would be lymphosarcoma, histiocytomas, mast cell tumors, and plasma cell tumors, to name a few.
Melanomas are a pretty common term being thrown around nowadays. Skin pigment is called melanin, and the cells that are responsible for creating melanin are also responsible for these tumors.
Lastly, mesenchymal tumors are tumors that develop in the tissue underneath or embedded in the skin. They could form in the fat tissue, nerve tissue, or in blood vessels.
Malignant cancer brings a great deal of pain to your dog. It causes him to suffer, and it causes you, as his loving owner, suffering as well. Knowing as much as you can about this disease is one way to help your pet, so that you are able to make clear, informed and educated decisions that may very well make a huge impact on both your lives.