Chondrodystrophy is associated with the expression of a retrogene encoding fibroblast growth factor 4 (FGF4) located on chromosome 18 [11]; however, a continuous spectrum of disc degeneration and IVDE/IVDP is seen both among and within chondrodystrophic breeds, suggesting a multi-factorial aetiology involving cumulative effects of several genes and environmental interactions [10]. The gene discussed is FGF4; the disease is intervertebral disk degenerative disorder.