The dermatologist decides to do a biopsy when:
Biopsy sampling is a painful procedure and therefore should be performed under local or general anesthesia. Whenever possible, in dogs, local anesthesia is preferred and does not require preoperative blood tests.
f general anesthesia is planned, preoperative examinations should be performed to ensure that there are no problems associated with this procedure.
The animal should not be washed or treated with local medications particularly at the lesions to be sampled.
The animal must have been fasting for 12 hours.