Kidney cancer
Kidney cancer is uncommon in dogs. The most common type is renal cell carcinoma.

Leukemias
Leukemias are progressive proliferation of cancerous white blood cells within the bone marrow, resulting in destruction of the bone marrow and pancytopenia in many cases. Types of leukemia in dogs include acute lymphoblastic leukemia, acute myelocytic leukemia, acute monocytic leukemia, acute myelomonocytic leukemia, acute megakaryocytic leukemia, chronic lymphocytic leukemia, chronic myelogenous leukemia, chronic basophilic leukemia, and chronic eosinophilic leukemia (or hypereosinophilic syndrome).

Liver cancer
Liver cancer is usually metastatic in dogs. Primary tumors are and include benign hepatocellular adenoma (hepatoma) and malignant hepatic carcinoids.

Lung cancer
Lung cancer is usually the result of metastasis in dogs. Primary tumors are rare. The most common type is adenocarcinoma.

Lymphoma
Lymphoma (lymphosarcoma) is a malignant cancer that is classified by location, cell type, and histological grade. The most common form in dogs is multicentric, involving the lymph nodes.

Malignant histiocytosis
Malignant histiocytosis is a disease found primarily in the Bernese Mountain Dog characterized by infiltration of the lungs, lymph nodes, and other organs by histiocytes

Mammary tumors
Mammary tumors in dogs are potentially benign or malignant. They occur most commonly in non-spayed females or female that were spayed later in life.

mast cell tumor
A mast cell tumor (mastocytoma) is a type of tumor normally found in the skin of dogs. It can also invade the subcutis and spread to the liver, spleen, or bone marrow.

Melanomas
Melanomas account for four to six percent of skin tumors in dogs and are usually benign. They are the second most common tumor of the toe and are malignant in this location. Malignant melanoma is also a common oral tumor in dogs. Malignant tumors most commonly spread to the lymph nodes and lungs.

Ocular tumors
Ocular tumors in dogs are found in the eyelid, conjunctiva, third eyelid, cornea, sclera, iris, ciliary body, retina, choroid, optic nerve, and orbit. The most common types are Meibomian gland adenoma (eyelid), papilloma (eyelid), melanoma (eyelid, conjunctiva, sclera, iris, ciliary body, choroid), squamous cell carcinoma (conjunctiva), adenoma (ciliary body), adenocarcinoma (ciliary body), lymphoma (retina, choroid, ciliary body), medulloepithelioma (retina, choroid), ganglioglioma (retina, choroid), osteosarcoma (orbit), mast cell tumor (orbit), and optic nerve sheath meningioma.

Oral cancer
Oral cancer includes tumors of the tongue, tonsils, gingiva, and palate. The most common types are squamous cell carcinomas, malignant melanomas, and fibrosarcomas.

Osteosarcoma
Osteosarcoma is an aggressive bone tumor in dogs that commonly spreads to the lungs. It is more common in large and giant breed dogs.

Ovarian cancer
Ovarian cancer is uncommon in dogs, with the most common type being the granulosa cell tumor. This type of tumor can metastasize and can cause cystic endometrial hyperplasia.

Perianal gland tumor
Perianal gland tumor (also called hepatoid tumor) is a type of tumor found near the anus in dogs that arises from specialized glandular tissue found in the perineum. They are most common in intact (not neutered) male dogs.

Plasmacytomas
Plasmacytomas are common skin tumors in dogs that derive from B lymphocytes. Most are benign. Tumors of B lymphocyte origin that affect the bone marrow and are diffuse throughout the body are malignant and are called multiple myeloma.