Symmetric Lupoid Onychodystrophy

Symmetric lupoid onychodystrophy is a condition in which the immune system appears to target the structures that anchor and grow the claws, leading to progressive claw loss and abnormal regrowth. It tends to affect multiple claws at once, often in a symmetrical pattern across the paws, and can involve all of the claws over time. The term "lupoid" reflects certain laboratory features rather than a connection to lupus in people. Owners often notice that one or more claws become brittle, discoloured, or begin to separate from the nail bed, sometimes with discharge or discomfort when the paw is handled. In many cases, claws may fall off entirely and regrow in a distorted or fragile form. The pattern of involvement and the way the claws look as they regrow can raise questions about infection, injury, or other claw disorders. This page explores the signals that may prompt consideration of this condition, what is understood about the immune processes involved, how the diagnosis is approached, and the range of management strategies that exist. The course and response to treatment can vary, and the aim of the page is to help orient your understanding of what may be happening and what the journey ahead might involve.