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Springers are one of the hardest-running breeds in the country. A working Springer can cover serious ground in a day, and even a pet one rarely does anything at half speed. That relentless drive is exactly why their joints benefit from support earlier than you might expect.
Because they're so willing, Springers will often keep going through discomfort, so you can't always rely on them to tell you when a joint is sore.
High-impact work, jumping in and out of cover and turning at speed, loads the joints far more than a gentle walk round the block. For a Springer doing that regularly, starting joint support in early middle age is reasonable prevention rather than fussing.
Green-lipped mussel is my ingredient of choice here for its anti-inflammatory omega-3s, which suit a dog whose joints take a daily pounding.

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 a hard-working Springer, from around four to five is sensible, given the mileage they cover. Pet Springers can start a little later, but this is a breed where early support pays off.
A well-dosed green-lipped mussel and glucosamine product such as YuMOVE Joint Care or Riaflex Joint Plus fits an active spaniel.
This breed hides discomfort and keeps working through it. Starting maintenance support before problems show is often wiser than waiting for a visible limp.