The Chihuahua dog breed is generally considered as the smallest dogbreed. Furthermore, most kennel clubs accept the Chihuahua dog breed as the smallest breed.

There are 2 separate kinds of breeds of Chihuahua. Chihuahuas can be categorised in two types, I.e.The “Smooth coat” also known as short-haired Chihuahuas and “Long coat” which is the long-haired counterpart. Contrary to other dogs with long hair, the Long coat Chihuahuas are easily groomed.

Others might claim that there is another categorisation of Chihuahuas, i.e. applehead shaped and deerhead shaped Chihuahuas. Appleheads are usually short-haired while Deerheads are usually Long coats. Although, neither the deerhead or applehead are officially recognised by major dog associations, they do have some distinct features. Apple heads tend to have rounded heads, a close set of eyes and short stumpy ears and legs. Deerheads have those little flat-topped heads. Their eyes are set more appart giving them a wider face. Additionally, their ears are much larger and longer. Whilst the Deer head chihuahua is not necessarily taller, its legs are much longer and more slender.

Going back in time, history tells us that Deerheads were popular in the mid-twentieth century. However, current breed standards defined by registries such as the Chihuahua Club of America and American Kennel Club specify the apple head conformation. Despite the applehead conformation there is a new trend popping up which is the mixing of the two breeds in order to create your personal hybrid. This trend, though, is highly discouraged as mixing between chihuahuas weakens the breed. In the UK, matings between the two are not eligible for KennelClub registration. The mixing of Applehead and Deerhead chihuahuas is usually done in the United States. This can also somewhat be linked to the popularity of the “Teacup Chihuahua”.