A 2-month-old intact female domestic short hair presented with physical abnormalities, including discharge of watery feces from the vagina, depression, and dehydration. The rectovaginal fistula and atresia ani type 3 were diagnosed on the vaginogram. During the anoplasty, the fistula could not be identified because the patient was too small. Instead of colotomy, feces were flushed out using a feeding tube. To prevent complications, a 1-cc syringe tip was sutured at the surgical site after the anoplasty. At the 3-month telephone follow-up after surgery, the cat was reported to have no further clinical signs.