If the dog requires general anesthesia it usually, in most cases, costs around two hundred. Then you have to factor in pain meds, surgical prep, hospitalization fees, sterile surgical gloves, doctors time, the size of the growth, whether or not it will get sent out for histopathology, pain medication and anti-inflammatories after surgery etc, plus the office call fee. It does add up. Given the dogs age, they may want to think twice about putting the dog under anesthesia. Perhaps they can ask about using telazol/torb/ace and a local anesthetic instead as that would lower their cost as well as the dog's risk of dying under anesthesia. A 12 year old lab is def at high risk of complications should it go under. It is eldery and frail.