Luxating patella can occur at any age in dogs, but it is most commonly diagnosed in young dogs between the ages of six months and two years. Small breeds such as Chihuahuas, Pomeranians, and Yorkshire Terriers are particularly prone to the condition, but it can occur in dogs of any size or breed. In some cases, luxating patella may be present at birth, while in others, it may develop as the dog grows and their bones and joints mature. The exact cause of luxating patella is not fully understood, but it is believed to be related to genetic factors, conformational abnormalities, and muscle weakness.