Macintosh is a 10-year-old Schnauzer that has diabetes. His caretaker Paula has been treating him with an injection of insulin twice daily for the past 16 months and he has been doing quite well. Paula checks Mac's blood sugar level three to four times weekly and he appears to be well regulated. Recently, Mac has developed a mass along the top of his back just behind his shoulders. When Paula first noticed the mass, it was raised and about the size of pea. It now has grown to about one-inch in diameter and has become reddened in color. Paula is understandably concerned about this mass and wants to have it removed but is also very concerned with the increased risk of infection associated with diabetes and surgery.