I cannot find any info on your website. These do not usually recur after surgical removal if a wide incision is made and tissue removed under the melanoma, too. It is a good idea to have tumors suspected of being melanomas removed and examined by a pathologist, who can give some idea of the potential malignancy. If it seem appropriate after examination by the pathologist chemotherapy can be used to try to limit the spread of the melanoma. Malignant melanomas sometimes in the skin of dogs and these are much more serious.
Most malignant melanomas occur in the oral cavity or on the toes of affected dogs.
These are much more serious and recurrence or spread of the tumor to other tissues is very likely. I hope this is a benign tumor. Mike, Thank you for the note about my Black Schnauzer's possible melanoma, and your advice about it. It is a benign melanocytoma, which I am told is precancerous. Would surgery, the way you describe with the wide incision and tissue removed under the tumor, be advised.