Biopsies help distinguish between benign and malignant tumors, diagnose skin conditions, evaluate organ disease, and identify infections that do not respond to standard treatment. Methods include fine-needle aspiration, punch biopsy, and surgical excision. The procedure often requires sedation or anesthesia depending on the location. Results typically take several days to a week. A clear pathology report guides your vet's treatment plan and gives a more accurate prognosis than visual assessment alone.