Dogs with extremely short body deformities and small dogs may refer to teacup dogs and dogs with brachyvertebral syndrome.

Measuring a standard size of less than 8 inches and weighing less than 4 pounds, the Teacup Dog is a beautiful puppy. However, because it is small and has skeletal defects, walking long distances can cause limb deformities and is prone to infection, so it needs special care.

Dogs with brachyspine syndrome have shortened spines and sometimes have abnormal bends and folds. , the tail, which is an extension of the spine, is also often underdeveloped, appearing as no tail or a short, spiral tail.