Our dog spent the last two months on bad food and he got obese. Our trainer suggested he should start on low fat food to loose weight (Welness reduced fat). The first day I gave it to him in the morning he ate half of the bowl (I always add a bit of milk).
Now yesterday evening and today he refused to eat (he did drink the milk) (the trainer suggested to take the food away if he doesn't eat it, as he needs to learn not to take it for granted as he used to play with his food rather than eat it).
He's not getting anything on the side. I guess if he's REALLY hungry he will eat. I just want to know when (after how many days) I should start to get worried about it.