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Objective: To report the technique and outcome of proximal ulnar autograft transplantation to achieve ipsilateral radial lengthening in a dog with premature closure of both proximal and distal radial physes., Study Design: Case report., Animals: An 8-month-old female spayed Border Collie., Methods: The dog was presented for a grade III/IV left thoracic limb lameness localized to the elbow. Orthogonal radiographs of both forelimbs revealed a 7% length deficit of the left radius and elbow subluxation indices indicative of left elbow incongruity due to suspect premature closure of both radial physes. Radial lengthening consisted of a proximal ulnar ostectomy, a radial osteotomy, and transplantation of the ulnar autograft into the radial osteotomy site secured with an eight-hole dynamic compression plate. Orthopedic examinations were conducted at 2 weeks, 4 weeks, and 3 years postoperatively. Radiographic examinations were completed preoperatively, immediately postoperatively, and at 4 weeks and 3 years postoperatively., Results: Lameness improved with a grade II/IV lameness at 4 weeks postoperatively and complete resolution at 3 years postoperatively. Radiographic examination at 4 weeks showed persistent radial lengthening of 1 cm, and a decreased humeroradial index (HRI), humeroulnar index (HUI), and radioulnar index (RUI) compared with preoperative values. At the 3 year examination, the HRI and HUI had increased indicating progression of elbow incongruity. The patient remained clinically unaffected., Conclusion: In dogs with radial shortening and elbow incongruity, use of an ipsilateral proximal ulnar autograft with rigid internal fixation can be an effective treatment for radial lengthening to improve elbow congruity and resolve lameness., (© 2024 American College of Veterinary Surgeons.)