Ruptured anal gland...........OMG

Female Pap, 8 y/o. Never any issues with anal glands. Fine one day, the next, BOOM, swelling/redness/weepy sore on her bum hole. Emergency vet; $450 later......she is on several meds and a cone of shame to keep her from licking the area. It looks much calmer today, and we have a follow up visit with her regular vet on Friday. There was NO warning; no fishy smell, no scooting, nothing. The E vet said she's been seeing a lot of anal gland issues lately with older dogs.

What issues have you experienced overnight with your pets (that had you whipping out your credit card)?