Our bichon Snowball was diagnosed with a fibrosarcoma on his knee at a young age and had to have surgery. Because of his history, he has to have surgery every time he grows a lump. So far he's had several, one of which was another fibrosarcoma. These have been low grade and the vet doesn't know why he keeps growing them - he had to have ultrasounds and CT to make sure no internal tumors but all is good. Neeless to say this has cost a small fortune and I can't thank my sister enough for recommending we get this insurance back when we first became "dog parents". We have 3 dogs and have needed to use it for at least one of my other dogs as well.