The symptoms of luxating patella can vary depending on the severity of the condition, but in some cases, they can be relatively subtle. You might notice that your pet is limping or favoring one leg, or that they have a skip in their step when they walk or run. In some cases, dogs with luxating patella may also hold one paw in the air and not let it touch the ground, particularly after exercise or prolonged periods of activity. This can be a sign that the dog is experiencing pain or discomfort in the affected joint. Other signs of luxating patella can include stiffness, difficulty jumping or climbing stairs, or a reluctance to engage in physical activity. In severe cases, you may also notice a popping or clicking sound when the joint is moved.