I have a one-year-old black cat who I fed the same kitten food both wet and dry for most of his first year. So when I switched him over to adult cat food I chose Purina wet food and Rachel Ray’s dry food. Then I started noticing that he had these dandruff pieces on his Furrer when I would brush him and that he seemed on interested in his food sometimes. Do I need to find a better food for him or am I just feeding him too frequently or what.