I think the Rocco Classic is one of the best tinned foods out there as it has no fillers to bulk it out - it's just meat and by-products. By by-products they mean "innards" - heart, liver, meat, stomach, throats, so all fine and natural for dogs to eat

I have fed Rocco Classic before and will do so again - it suits Sherlock and his ultra-sensitive stomach, and he loves it.
(Lukullus is good food too, but unfortunately I haven't yet found a flavour that suits Sherlock's tum, although the food looks and smells good and has good ingredients.)