Here's their claimed key benefits:
Glucosamine provides joint health throughout a Yorkshire Terrier's long life
Enriched with Omega 3 fatty acids (EPA and DHA), Omega 6 fatty acids and biotin
Formula satisfies the fussiest of appetites with a combination of exceptional aromas and flavors
Breed-specific food for Yorkshire Terriers over 10 months old
There is also a yorkie puppy version available for those who would like to look at that.
Royal Canin Yorkshire Terrier Puppy Dry Dog Food, 2.5-lb bag