Case Description-A giant breed dog under one year old with non-weight bearing on left forelimb and the history of pyrexia, diarrhea and anorexia was referred to veterinary clinic of Ferdowsi University of Mashhad. Clinical Findings- On physical examination showedthe left hand has an extra digit on ulnar side; the limbs were generally warm to the touch and painful upon deep digital palpation.Footpad hyperkeratosis was seen symmetrical bilaterally and non-edematous soft tissue swellings on distal portions of all four limbs. Abnormal breath sounds was heard in lung auscultation. In radiographic evaluation radial meromelia of the left forelimb, ulnar polydactyly and hypertrophic osteodystrophy was diagnosed. Treatment and Outcome- The owner of the dog didn’t approve payments for any treatments and we couldn’t perform further examinations. Clinical Relevance- Meromelia is a birth defect characterized by the lacking of a part, but not all, of one or more limbs with the presence of a hand or foot.It results in a shrunken and deformed extremity and may either present as an isolated defect or associated with other malformations; and the diagnosis is mainly clinical. Ulnar polydactyly, refers to the presence of an extra digit on the ulnar side of the hand. This is the first reported case of radial meromelia and ulnar polydactyly associated with hypertrophic osteodystrophy in a dog. Hypertrophic osteodystrophy is a common pathological condition associated with a broad spectrum of diseases. The aim of this case report is to highlight the condition and remind clinicians of its relatively common incidence, as well as to prompt clinicians to look for underlying pathology.

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