I can't see how a flush would be justified. If the abscess has not yet burst, we will express the sac as best as possible and instill medication into the sac. Accordingly, partnering with a board-certified veterinary dermatologist may be uniquely helpful to identify an underlying issue that predisposes a patient to anal sac impaction. Be aware of any changes in stool shape thin and pencil-like or behavior pain or straining to defecate, scooting, looking anxiously at hind end. The frequency will depend on the patient.