When we adopted our Scottish Terrier, the owners said 'Oh he only likes the really cheap food like Purina, with water and ketchup..you gott aput kethcup or he wont eat it".
I was a bit mortified.
So we've switched him over to Natural balance, which he eats just fine and wolfed down the first time we gave it to him, WITHOUT ketchup I might add. Sometimes as treats we get that doggie gravey, or I just add some hot water and brewers yeast to it and he likes that as well