If the vet has given them the all clear, I would change food. Novak was the same on arden grange puppy, changed him and he was all good, the vet recommended changing him to a lesser used protein, as did arden granged nutritionist.

That said, since it's happening to both your dogs I'd be taking samples etc to the vets and getting them checked. Just for my own piece of mind really, of nothing else.

If you do decide to change food, Skinners duck and rice ingredients are identical to burns duck and rice, besides seaweed, and I highly dound seaweed is worth an extra £25.

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