[LIL MIS' MAGIC]

I was just wondering how long Yorkies are considered to be puppies?? The other day at the pet store one of the workers told us that for little breeds that they are considered to be puppies longer than normal, like 16 months...and that we should continue to feed them puppy food that long...is this true??? I have never heard that before but he really seemed to know what he was talking about!!!