Here's why:
* Chihuahua Breed Standards: The American Kennel Club, the governing body for dog breeds in the United States, defines the chihuahua as having a round, apple-shaped head.
* Deer Head: The term "deer head" typically refers to a head shape common in certain breeds like the Doberman Pinscher, with a more elongated muzzle and a pointed head, rather than a round, apple-shaped one.
* Variations Within the Breed: While all chihuahuas should have an apple-shaped head, there can be some variations in the exact shape and size of the head within the breed. Some chihuahuas may have slightly longer muzzles or a slightly more pointed head than others, but this does not make them a different breed or give them a distinct "deer head" characteristic.
Therefore, if you hear someone talking about a "deer head chihuahua," it's likely they are using a casual term to describe a chihuahua with a slightly different head shape.