There is no such thing as a "miniature" Yorkie. Yorkies are just Yorkies. The AKC standard calls for "not to exceed 7lbs" but a lot of Yorkies end up bigger, or smaller than usual. But there are no separate classes, such as a Poodle (Toy, Mini and Standard).
For reference, my very active 16lb boy eats between 1/2 cup per day on average. I up it when he is more active. But every dog is different and has different metabolisms. |