Oscar is going through the same phase.

I e mailed Arden grange and they are going to send me some samples of their other flavours but the girl said it was really common at this age for them to get fussy and to just keep giving it to them.

I admit i have given in and am adding a tablespoon of natural youghurt to Oscars meals as he likes it and it is good for his gut (he is dairy tolerant though and not all dogs are)