Never used the concentrate but have done a few bags of the big square ones and the smaller slabs of biscuit. Got too expensive and as dog got older not so good for him either as got fat. Went to a age appropriate dried food, ( Ilams age health) and he is better for it. i always supplement the dry food with gound processed dog roll but use the less wet varieties such as possyum and chunky. i once worked in a dog food factory and I know whats in the wet rolls, so I guess its the same stuff in the dryier rolls but less water.
Edit the stuff in them is actually OK apart from the TVP (textured vegetable protein) they use to bulk it out and adds a tonne of free water. that they get to charge you for.
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