http://www.newsweek.com/cancer-dogs-signs-most-common-worst-affected-breeds-1778316

Just like in humans, cancer can be devastating for dogs. Cancer is the leading cause of death in dogs, with the American Veterinary Medical Association estimating that almost half of canines over the age of 10 will develop the disease.

Prior studies have shown that certain dog breeds are at a higher lifetime risk of developing cancer. Common breeds in the United States at an above-average lifetime risk of cancer include Bernese mountain dogs, boxers, French bulldogs, golden retrievers, Great Danes, mastiffs, rottweilers, flat-coated retrievers, German shepherds and Labrador retrievers.