This refers to a toy dog created with a domed or rounded skull.
The design often comes from the Chihuahua dog-breed which is a small dog with a very rounded skull with bulging eyes. The Chihuahua breed has the deer-head and the apple-head rounded skull skeleton. It is believed that a genetic evolution happened to the Chihuahua breed which caused the differences in the shape and physical traits of this breed. The apple head Chihuahua dog has small ears, a rounded skull, small size eyes and very big eyes.
The term “apple head” refers to many other concepts or meanings such as lovers of the Apple products.
Toy dogs with apple heads can be very attractive with flurry hair and small size. As said earlier, the major characteristic of an apple head is the shape – a rounded head or domed skull.