Achondroplasiais in dogs is variously referred by orthopedic specialists as ACH, Achondroplastic dwarfism, Chondrodystrophia fetalis, Chondrodystrophy syndrome, Congenital osteosclerosis, Dwarf, achondroplastic, and Osteosclerosis congenita. These various definitions mean the same abnormal development of bone from cartilage. 1
Offspring can look normal at birth and weaning, but at the age of 2.5 to 4 months the longitudinal growth of the spine and leg bones can retard in the dwarfs compared with the normal littermates. Most dwarfs perform well, even in the field.5 In dogs, achondroplasia can be a mild condition, with slightly bowing or simply short legs, causing no discomfort to the animal, or severe, in which case extensive orthopedic surgery may be needed to both alleviate pain and allow the dog to function normally. This surgery, most frequently an ulna, or radius/ulna surgery, is generally performed at one year of age, when bone growth is nearly complete. Surgical success is variabl