What is a characteristic feature of malignant tumors in dogs?

Malignant tumors in dogs are characterized by their invasiveness and ability to metastasize. This means that they have the potential to invade surrounding tissues and spread to other parts of the body through the bloodstream or lymphatic system. This invasive behavior distinguishes malignant tumors from benign tumors, which typically do not spread and are often encapsulated, possessing well-defined borders.

Additionally, the capacity for metastasis is a key feature of malignancy. Tumors that spread to distant sites can dramatically affect the overall prognosis and treatment strategies for the affected animal. Understanding the behavior of malignant tumors is crucial in veterinary oncology for making informed decisions about diagnosis, treatment, and management.