Ununited anconeal process (UAP) is a disorder of the elbow joint in which a small fragment of bone becomes detached from the ulna. UAP is a developmental abnormality and is common in dogs of large breeds. As a result of this condition, the elbow joint becomes unstable causing lameness and pain which are seen in dogs of 6-12 months of age. Affected dogs are lame on the affected limb and show a limited range of motion. The physical examination can be highly suggestive of the condition but for definitive diagnosis radiographs of the elbow are taken. If UAP is diagnosed in one limb, the opposite limb should also be examined as in 1/3rd cases the disease occurs on both sides. Surgery is performed to remove the anconeal process from the joint but if arthritis has already settled into the joints, it is very less likely to be benefited from the surgery. Dogs with UAP will develop some degree of arthritis which can be made less severe and painful by surgical removal or reattachment of the bone. To delay the progression of arthritis maintaining ideal body weight is recommended which helps in slowing down the pressure on the elbow. For inflammation of joints, anti-inflammatory medication and dietary supplements are advised along with physical therapy to keep the muscles flexible and strong.