The face is one area that the breeder has some leeway with. The standard says:
Quote:
Head: Small and rather flat on top, the skull not too prominent or round, the muzzle not too long, with the bite neither undershot nor overshot and teeth sound. Either scissors bite or level bite is acceptable. The nose is black. Eyes are medium in size and not too prominent; dark in color and sparkling with a sharp, intelligent expression. Eye rims are dark. Ears are small, V-shaped, carried erect and set not too far apart.
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So how do you define "not too long." Most good breeders believe that structure is so much more important than facial beauty as it impacts health. The yorkie should not have any type of "smushed" face though, and I hope breeders avoid this look because it has been known to cause breathing problems in other breeds, not saying it isn't adorable, but health should always be the first consideration, in my opinion.