The paper describes a case of atresia coli in a new born foal. Final diagnosis of atresia of the small colon was confirmed during laparoscopy. The blind end of the small colon was distended and had a diameter of approximately 7 cm. Rectum was very short and narrow. Length about 5 cm and diameter about 6-7 mm. Side to side anastomosis between the rectum and colon was performed. Recovery from anesthesia was uneventful. Six hours after the surgery patient was very painful and died 2 hours later. During post mortem examination ruptured of anastomosis site was found.