This case report concerns a 14-month-old Dogue de Bordeaux with osteochondritis dissecans (OCD)and fragmented coronoid process (FCP). As to breed and age, this is a very typical case of elbow dysplasia.However, the different steps that were required to come to a correct diagnosis made the case to be particular.The dog was presented with complaints of acute progressive lameness. Based on clinical and radiographicexamination, a presumptive diagnosis of bilateral FCP was made. No obvious primary lesionswere found during arthroscopy. Due to persistent lameness, computed tomography was performed, whichrevealed an OCD lesion in the right elbow and a fissure in the left elbow. Eventually, both elbows weretreated by means of a second arthroscopy, with good results. This case illustrates that arthroscopic inspectionof the elbow should always be done thoroughly, especially for the detection of OCD and fissures as bothlesions are sometimes difficult to be observed.