Aseptic femoral head and neck necrosis (Legg Calvé Perthes disease)
Aseptic femoral head and neck necrosis is an uncommon disease of immature or young adult toy breed dogs. It is most often seen in terrier breeds, miniature poodles and miniature pinschers. Affected dogs develop hind leg lameness from around 5 months. The condition usually occurs on only one side and affects males and females equally.