How Did Chihuahua Get So Small? Reason Explained

The Chihuahua, with its petite stature and big personality, is undoubtedly one of the world’s most adorable dog breeds. These tiny canines have captured the hearts of dog lovers worldwide, but have you ever wondered how they became so small? 

In this article, we will embark on a journey through time and genetics to unravel the fascinating story of how the Chihuahua got so small. Join us as we explore their ancestral roots, the influence of selective breeding, and the intricate genetics behind their diminutive size.

The Ancestral Roots

To understand the origins of the Chihuahua’s diminutive size, we must first delve into their ancestral roots. Chihuahuas are believed to be descendants of a small, ancient breed known as the Techichi. 

These tiny dogs were kept as companions by the ancient civilizations of Mexico, including the Aztecs and the Toltecs, as far back as the 9th century.

The Techichi dogs were revered for their small size and were often associated with religious rituals and superstitions. 

These ancient dogs were a vital part of the cultural tapestry of Mexico, and they set the stage for the development of the modern Chihuahua.

Selective Breeding: A Key Factor

While the Techichi laid the foundation for the Chihuahua’s small size, it was the process of selective breeding that played a pivotal role in shaping their diminutive stature. 

Over centuries, breeders in Mexico and later in the United States selectively bred these small dogs to emphasize and maintain their tiny size.

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One of the key objectives of selective breeding was to preserve the small size of the Chihuahua, ensuring that these dogs remained as tiny as possible. 

By carefully choosing which dogs to breed based on their size and physical characteristics, breeders were able to refine and standardize the breed’s appearance.

The Influence of Toy Breeding

The term “toy breed” is often associated with dogs that are particularly small, and the Chihuahua is no exception. In fact, Chihuahuas are classified as a toy breed by major kennel clubs worldwide. 

The concept of toy breeds in the dog world focuses on breeding dogs for their diminutive size and companionable nature.

Toy breeding, which became increasingly popular in the 19th century, contributed significantly to the Chihuahua’s small size. 

Breeders selectively bred Chihuahuas that exhibited the tiniest dimensions, gradually reducing the average size of the breed. This emphasis on small size led to the adorable Chihuahuas we know today.

The Role of Genetics

Behind every trait in a dog breed, there’s a genetic explanation, and the Chihuahua’s small size is no exception. A gene known as the “Dwarf gene” (also called the “C” gene) plays a central role in determining a Chihuahua’s size. 

There are two variations of this gene: C and c. Chihuahuas that inherit two copies of the “C” gene (C/C) are the tiniest of the tiny. These dogs have extremely short legs and a compact body, making them the epitome of the breed’s small size. 

Chihuahuas with one copy of the “C” gene and one copy of the “c” gene (C/c) are slightly larger, while those with two copies of the “c” gene (c/c) will be larger still.

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Selective breeding over generations has ensured that the majority of Chihuahuas carry the “C” gene, maintaining their small stature. 

However, it’s important to note that genetics alone cannot explain the Chihuahua’s size; selective breeding practices have been crucial in preserving and accentuating this trait.

The Chihuahua’s Continued Popularity

Despite their tiny size, Chihuahuas have won over the hearts of dog lovers around the world. Their feisty personalities, loyalty to their owners, and endearing charm make them cherished companions. 

These pint-sized pups are often seen in the arms of celebrities, on social media, and in popular culture, further cementing their status as one of the most beloved dog breeds.

In recent years, Chihuahuas have also become known for their diverse coat colors and patterns, adding to their overall appeal. 

Their adaptability to various living environments, from apartments to suburban homes, makes them an excellent choice for many households.


The Chihuahua’s journey to becoming one of the smallest dog breeds in the world is a fascinating tale of ancestry, selective breeding, and genetics.

From their ancient roots as the Techichi to the careful practices of breeders, the Chihuahua’s small size is a result of a long and intricate history.

As we admire these tiny dogs, it’s important to remember the role that responsible breeding plays in maintaining their size while also ensuring their health and well-being. 

The Chihuahua’s continued popularity is a testament to their enduring charm and their unique place in the world of dogs. 

So, the next time you encounter one of these pint-sized wonders, you’ll have a deeper appreciation for the captivating story of how the Chihuahua got so small.