Light-Chasing Compulsion

Light-chasing compulsion describes a pattern in which a dog becomes intensely focused on chasing or fixating on reflections, shadows, or other moving points of light. The behaviour often begins with a single episode—a reflection from a watch, light through a window, a torch played on the wall—and in some dogs develops into a preoccupation that can occupy hours of the day. The dog may stare at walls or floors, scan for the trigger constantly, or become alert to any flicker of light or movement in the environment. Owners often arrive at this page because their dog has started behaving in a way that feels repetitive, difficult to interrupt, or out of proportion to the original game. The behaviour may occur spontaneously, triggered by sunlight, television screens, or reflections from everyday objects. In some cases it interferes with rest, play, or the dog's willingness to settle. This page explores the signals that suggest a compulsive pattern may be developing, what is understood about the mechanisms that sustain repetitive behaviour, the ways in which the behaviour is assessed, and the range of approaches—environmental, behavioural, and in some cases pharmaceutical—that may be considered depending on the nature and impact of the pattern.