Dry, tinned or raw?! Decision, Decision..

Feeding for two constantly hungry dogs are not easy, especially they've recently been spoilted by my mum-in-law with fresh cooked pasta and yummy tuna. Since they got back from their Christmas indulgence, they've both turned their nose up their usual dry biscuits and as much as I tried to mixed most of it with wet tinned food (which they use to wuff down in seconds), their bowls remain untouched..so follow me to my bizarre search of the best diet for two very different kind of dogs.