What ingredients should I look for in a dog joint supplement?

The consensus across reviewers points to glucosamine hydrochloride, chondroitin sulfate, and MSM as the core trio, with omega-3s, green-lipped mussel, ASU (avocado/soybean unsaponifiables), and hyaluronic acid as common add-ons. Formulas that include ASU, like the Dasuquin line, are frequently cited by community posters as a step up from basic glucosamine-only chews.