We had this issue with out dog. Were expressing them internally on a weekly basis. After trying food changes etc. with no improvement, we opted for Sx. The surgery is tricky mostly due to the bacterial content of the area and a ruptured gland; however, find a specialist in this area, ours was in Bethesda and routinely removed glands from ferrets and skunks etc. as well. Sx is a last resort, but worth it in the event when all else fails, just research your vet.