These can occur in nearly any part of your cat's body, but pay special attention to persistent swelling or inflammation in the mammary glands, particularly in unspayed females. Early detection and treatment give your cat the best chance of survival.

These are unusual growths or swellings that can occur anywhere on the body of a fish. There are a range of causes, including polluted water, viral infection and an inherited genetic tendency. Most tumours are untreatable and the afflicted fish should be humanely destroyed.