M.R paryani - Department of Basic Sciences, Faculty of Veterinary Medicine, Karaj branch, Islamic Azad University,Karaj, Iran

Polydactyly is the congenital presence of one or more extradigits. The extra digit often does not contain a full complementof bones. Unilateral syndactyly and polydactyl mixed-breeddog was used as a case study. A three-month old unvaccinatedintact female mixed breed dog weighing 8 kg, presented witha deformity of the left forepaw was used for this study. Thedeformity had been present since birth according to the owner.During physical examination the dog was given a lamenessscore of 0/5 for the affected limb. A complete blood count, andserum biochemistry did not reveal any abnormalities. Radiographsof both distal forelimbs were obtained. These showedFused 2nd and 3rd metacarpal bones, a rudimentary metacarpiand a hypoplastic digit located on the axial side of the distalend of the left forelimb. As a result of the lameness score of 0/5and the owner’s lack of interest, a decision was made to monitorthe condition and consider surgery once the dog had grownlarger. It seems this is the first case of polydactyly associatedwith syndactyly and the rudimentary metacarpal bone.

polydactyly, syndatyly, dog