You should have her examined by her veterinarian very soon. Gangrene would be very unusual, but if it were gangrene it would be a medical and surgical emergency. If she is eating and drinking normally and her activity level is normal than she may have vaginitis or a urinary tract infection. There is only one opening in the dog for the vagina and urethra. Your veterinarian will request a urine sample from your dog to do a urinalysis, and will also possibly do a culture and sensitivity of her vaginal secretions to determine the best antibiotic, antifungal, or other medication necessary. Atlernately your dog could have an infection of the uterine stump. A small portion of uterine tissue is left after a dog is spayed and though uncommon, it can become infected. Other diagnostics will also be necessary, such as bloodwork and abdominal X-Rays. Hope this helps! Thanks, Dr. Cheng
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