Degenerative joint disease in cats causes widespread chronic pain that is among the most undertreated welfare problems in companion animal medicine.
The gap between DJD prevalence - affecting the vast majority of older cats - and treatment rates reflects how poorly cats communicate chronic pain and how inadequate the clinical recognition framework has been. The absence of obvious pain behavior leads owners and many veterinarians to attribute mobility changes to aging rather than treatable pain. When cats with confirmed DJD are treated with appropriate analgesia, owners consistently report improvements in activity, social engagement, and grooming that retrospectively quantify the suffering from untreated pain. The development of long-acting injectable pain medications that eliminate the stress of daily oral administration is significantly improving treatment feasibility for cats.