Well, when ours were little, I didn't know about Royal Canin. We fed ours Pro Pac puppy and they loved it. Royal Canin has a puppy food. You need to feed them puppy food until they get to be a year old. Puppy food has all the nutrients they need to grow on. I was given Iams when we got them, but they didn't like it so I went and did some research and found the Pro Pac. It (at the time) seemed to be very good and when I went to Pet Warehouse to buy it, the guy said it was a very good choice. You can mix in a good quality canned puppy food to soften it up if he seems to have a problem crunching it. Our Chuhga never had a problem, but Waya is much smaller and he didn't like the hard stuff.
We also had to take him and get his puppy teeth removed. After that he didn't mind the hard stuff. Up here in south central Missouri, the vet cost for that was $20. I was really surprised at the cost. He had about 8 (?) teeth that needed to come out. I have a picture of his mouth with his extra teeth in (right before we took him to the vet.