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Cockers, working and show lines alike, are busy dogs that never really switch off. All that trotting, jumping and quartering keeps them fit but does add up on the joints as they age. The breed can also gain weight quietly if the exercise drops off, which doesn't help.
They're a medium dog, so dosing is straightforward, just match it to their actual weight rather than guessing.
For most Cockers this is about maintenance, keeping healthy cartilage healthy through a long active life rather than rescuing a badly arthritic joint. Green-lipped mussel and glucosamine given daily from middle age is the sensible approach.
Watch the waistline. A Cocker that's slowed down but still eats like a working dog will gain weight, and that extra load reaches the joints. Adjust food to activity as they age.

The default for a reason. Strong green-lipped mussel dose and the widest trial record. Chews most dogs take as a treat.
Check Price on Amazon →Tablets declaring 334mg glucosamine and 150mg chondroitin each, plus MSM and collagen, at one large tablet per 10kg a day. The cheapest declared-dose option here at £14.99–£29.99. (Do not buy Mobile Bones for this job — it declares glucosamine at 1.4% of a powder — and Bionic Biotic is a gut supplement with no joint actives at all.)
Check Price on Amazon →Higher dose, aimed at dogs already stiff rather than early prevention. The one to reach for when the damage is done.
Check Price on Amazon →A vet-counter staple. Tightly dosed and easy to give over food.
Check Price on Amazon →
For an active or working Cocker, around age five is a reasonable point to start maintenance support, earlier if they're doing heavy fieldwork.
A daily green-lipped mussel and glucosamine product like YuMOVE Joint Care or Synoquin, dosed for their weight, suits the breed well.
Yes, like most active breeds they can develop it with age. Keeping them lean and supporting the joints from middle age helps them stay comfortable for longer.