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Dogs + Tumors

  • Fibrosarcomas and spindle cell tumors originate 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.

  • Fibrous tissue consists of long fibers of the collagen protein. These fibers form a structural part of specialized tissues such as bone and cartilage.

  • It is important to recognize that multiple tumors in the liver are not always cancers. The livers of older dogs may become nodular without causing any clinical effects.

  • The liver has a massive blood supply so many cancer cells from elsewhere arrive within it and start to grow. In dogs, metastatic tumors are three times as common as primary tumors and over 30% of malignant cancer may metastasize to the liver.

  • Most primary lung cancers originate from the epithelium lining the airways. In dogs, most develop in the alveoli where oxygen is taken up into the body, but in people and in cats most originate in the main airways (bronchi).

  • This is a tumor of the lymphatic vessels of the skin or subcutaneous tissue.

  • Lymph is a fluid that circulates in the body, transporting cells of the immune system (macrophages and lymphocytes) to sites where they are needed and draining areas where excess fluid or debris has accumulated, such as occurs with inflammation.

  • Lymphoma is a cancer of the lymph nodes and lymphatic system. This cancer may be localized to one particular region, or may spread throughout the entire body. Lymphoma is a relatively common cancer, accounting for 15-20% of new cancer diagnoses in dogs. The prognosis for lymphoma varies, depending on various characteristics that can only be determined by specialized testing.

  • This is any tumor originating from the mammary gland tissues. In the dog, most tumors of this type are cured by complete surgical removal, but over time a few progress to malignancy and start to spread to other parts of the body (metastasis).

  • This is a tumor originating from the mammary gland tissues that has been classified as malignant (invasive and capable of spreading). Although some of these cancers are cured by surgical removal, others will recur locally and some spread to other parts of the body (metastasis).

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