Dogs like humans can develop both benign and malignant tumors. Some of the most common tumors seen in dogs are melanomas, lymphoma, bone cancer. Mast cell tumors can occur in all the different breeds of dogs irrespective of their age. Tumors may appear to be benign in appearance, but could ultimately turn out to be malignant.

The mast cells are a part of the immune system of the body and their cells are located in the tissues and skin of the body. In instances where a mast cell tumor appears if it is correctly recognized and treated it can be managed. Some of these tumors are able to be removed safely and even though they are small in appearance they could if ignored lead to a serious cancer developing in the dog.

Lymphoma which affects organs of the body such as the liver, spleen, kidneys and other organs has in many instances by using chemotherapy led to an extension of the dog’s lifespan sometimes by many months and in some instances by a number of years. Lymphoma cancer often manifests itself in the form of lumps or swellings on the body of the dog.

As with other genetic diseases certain large breeds of dogs are susceptible to certain cancers. The Golden Retriever is a breed of dog that is prone to lymphoma cancer which could shorten its life. There is a mortality rate of about ten percent if this animal contracts the cancer. Other breeds of dog such as Boxers and Pugs have a tendency to develop mast cell tumors. One breed of dog that stands a very high risk of developing a cancer of the bladder is the Scottish Terrier. Dogs which have unpigmented skin on their noses are susceptible to developing cancer if they have too much exposure to sunlight.