Lately (I would say this started about two week ago) Oscar's eating behaviour has changed. I normally feed him twice a day - he gets about 250 gr a day, like it says on the package for a dog his size and weight. But he will not finish his food like he used to. In the evening, when it is time for the second feeding, he will still have food left. Most days he ends up eating the normal amount by the very end of the day - but not always. He's not enthusiastic about his food at all. He eats other things I offer him: treats and chew toys like rawhide and bully sticks. Why isn't he eating like he did before? Does this mean anything? Or is it because he doesn't 'like' his food?