Suma

Hi I have a 13 weeks old cocker spaniel. He seems to be picky eater. Even when he is hungry he sometimes refuses kibbles. So I have been trying different brands and even fresh home food and wet food. I am told that we should stick to the same food for puppies and gradually change.But he seems to eat better if given different food on different meals. Am I ok to do this? Which are the good brands What do you think of ? taste of the wild royal canin forthglade wet food. If preparing fresh at home - how much meat should be given ( as per weight ) to a puppy? Many thanks Suma