Are all tumors of cats and dogs malignant?
No. As in humans, many different cancer types are known. Some are benign, this means they do not penetrate into the surrounding tissues and don't spread to other body parts, others are malignant, behave aggressively, penetrate into surrounding tissues and form metastases in other body regions. We see in dogs and cats the same cancer types as in humans, however with different frequencies: for example, large breed dogs suffer from bone cancer ten times more than humans.