Idiopathic multifocal osteopathy in four Scottish terriers (1991-1996)

This case series describes four Scottish terriers with an osteopathic condition, characterized by multifocal absence of bone in the skull, cervical spine, and proximal radii, ulnae, and femora. All dogs were affected clinically; two dogs were euthanized due to progression of the disease, one died acutely, and one was euthanized for an oral melanoma. Histopathology in one case was characterized by osteoclastic osteolysis and replacement of bone with fibrous tissue. This disease has some characteristics of human osteolysis syndromes. Three of the dogs were related through pedigree analysis, and the pedigree of the other dog was not available. The name, idiopathic multifocal osteopathy, is used to describe a new disease in dogs, found particularly in Scottish terriers.