Other less common conditions which appear in the breed include hydroxyglutaric aciduria, which is where elevated levels of Alpha-Hydroxyglutaric acid are in the dog's urine, blood plasma, and spinal fluid. It can cause seizures, muscle stiffness, and ataxia, but is more commonly found in Staffordshire Bull Terriers. A degeneration of the hip joint, known as Legg–Calvé–Perthes syndrome, also occurs in the breed. However, the chances of this condition occurring are much higher in some other breeds, such as the Australian Shepherd and the Miniature Pincher. The breed is also one of the least likely to be affected by a luxating patella, where the knee cap slips out of place.