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Two types of total hip prostheses were implanted in three dogs that had been previously treated by excision arthroplasty, two for degenerative joint disease secondary to hip dysplasia and one for removal of a fractured femoral neck. Complications occurred in one case when the femoral shaft was split during the reaming process for implantation of the prosthesis and at three weeks after surgery when an oblique fracture of the distal femur occurred. Both complications were treated successfully. The time since surgery varied between eight and 18 months. All three dogs had excellent functional results evidenced by increased joint mobility and freedom from pain.