Big dog is not food orientated in the slightest, and is slightly underweight. She's usually fed on Fish 4 Dogs or Purizon. At the minute, I'm having to feed her 3 times a day as she's on medication which requires this, so I'm having to be creative with what I feed her to get her to eat it all up! She's been having sardines mainly, mixed in with her kibble, but it's a bloody expensive way of doing it, especially as the pup smells fish and suddenly doesn't want his dry food 
I bought a tin of Lily's Kitchen from the Co-op earlier, which they have both wolfed down with kibble mixed in, but at £2.19 a tin, it's again not cheap. I noticed my local Poundstretcher is selling Naturediet for 99p for a 390g tub which seemed reasonable - is this a pretty good food? Big dog has issues with grain in dog food, so needs to be gentle on her stomach, but I've not got an endless vat of money to spend on mega-expensive stuff!
Planning on keeping up feeding part wet/part dry as she's eating much better and I think it will help her get a bit of weight on (currently a couple of kg under what she should be).