Case Description.: In this present study three cases of perineal hernia in dogs have beenpresented and new concepts in perineal herniorrhaphy have been introduced. A 5-year-oldintact male Spitz dog, a 6-year-old intact male dachshund dog and a 4.5-year-old sexuallyintact male Welsh corgi dog were referred with swelling around the anus and dyschesia.Clinical Findings: The owner complained about a sudden enlargement of the right perinealregion. Physical examination revealed soft bulged area surround and in the right side ofanus. Plain radiograph showed normal position of urinary bladder and prostate.Treatment and outcome: All the dogs were treated surgically by the internal obturatormuscle flap technique which were transposed dorso-medially into the defect and suturedinto defect borders. No complication was observed after surgery in any of the dogs. Thedogs were monitored weekly for one month. The final evaluation revealed that all dogswere clinically normal and the owners were fully satisfied with the outcome.Clinical Relevance: This study proved that the internal obturator transposition techniquewas superior technique for perineal hernia cases among all suggested techniques .