Is found where limb was improperly set, or the dog in unhealthy condition. It is the non-union of the bone by the usual osseous deposits, instead of which there is a fibrous connection, the union of the bones, or portions of them, is much like they had been united by a piece of India rubber; the two pieces of bone can be readily moved, while the limb cannot support any weight. An operation is often attempted to set up inflammation of the parts, and induce osserous or bony deposits, but experience has proven such operations not very successful.