Six hundred and thirty one dogs with long bone fractures were treatedat the clinics faculty of Veterinary Medicine, Cairo and kafrelsheikhUniversities, during the period from January 1998 to January 2009.Out of 631 cases 90 cases showed 273 different types of complications.These complications were classified into two main types: Those fromimproper management (47.6%) which included fracture disease (21%)and implant failure (26.6%). While the other type of complicationswere referred to fracture healing (52.4%) which included delayedunion(16.1%), non-union (8.8%), mal-union (6.2%), hypertrophiccallus (15.3%) and osteomyelitis (6%). The incidence of complicationswere studied and discussed in relation to the age, the weight of theanimal, type & state of fracture, concurrent soft tissue injuries, type ofreduction and the method or methods of fixation. The recordedcomplication were assessed radio-graphically and some of themundergone to surgical management.The obtained results showed that the incidence of complications wasvery high in humeral (29.3%) and femoral (35.2%) fractures particularlyin young and senile ages, heavy weight dogs, long standing old fractures,compound comminuted fractures associated with severe concurrentsoft tissue injuries and those fractures fixed via external cooptation orexternal skeletal fixation (ESF) and in some fractures fixed by internalfixation. Treatment options gave satisfactory results in terms of rapid return tofull limb function in some cases of slight malalignment, hypertropiccallus, delayed union, joint stiffness with mild arthrosis and earlystage of muscle atrophy. However unsatisfactory results were obtained interms of severe lameness in case of long standing old fractures, jointstiffness with severe arthrosis, late stage of muscle atrophy, recurrentimplant failure, non union and osteomyelitis.The present study emphasized on the importance of the age, weight,type of fractured bone, type of fracture, state of fracture, concurrentsoft tissue injuries, type of reduction and the method or methods offixation. All these factors collectively should be taken in considerationduring long bone fracture management. Otherwise if one of thesefactors is neglected single or multiple complications will take place.