Welcome to YT. Good luck with the vet, and I love the pic with his tongue out, very handsome young man there. I have my puppy on Royal Canin, but not the Yorkie 29, Gina had an allergic reaction to that one. Everyone here has their favorite brand of food for their furbabies, so I'd ask your vet for an opinion, but as long as he's healthy and not having any reactions to his food, I'd stick with it, Yorkies are notorious picky eaters. Enjoy and good luck.
Cheers Quad
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RIP Megan 3/1998-5/28/2013