What causes shih tzu

What Causes a Shih Tzu to Be a Shih Tzu?

The question of 'what causes a Shih Tzu' to be the breed we know today is best understood through the lens of selective breeding and canine genetics. Shih Tzus are not the result of a sudden mutation or environmental factor, but rather the product of centuries of intentional human intervention in breeding dogs to possess specific desirable traits. Their existence as a distinct breed is a testament to the power of planned lineage and the preservation of genetic lines.

Historical Origins and Development

The origins of the Shih Tzu breed can be traced back to Tibet, where they were developed as far back as the 17th century. It is widely believed that they were bred down from larger Tibetan breeds, most notably the Lhasa Apso, and possibly influenced by other small, companionable breeds like the Pekingese. These dogs were highly revered and considered sacred within Tibetan monasteries. They were often gifted to Chinese royalty, where they continued to be bred and refined.

During the Ming Dynasty in China, these small dogs became increasingly popular among the imperial court. They were bred to be lap dogs, cherished for their affectionate personalities, distinctive appearance, and manageable size. The Chinese imperial breeders dedicated themselves to perfecting the breed, aiming for specific characteristics that defined the Shih Tzu we recognize today. This included their long, flowing coat, their short muzzle (brachycephalic face), their sturdy build despite their small size, and their outgoing, friendly temperament.

Selective Breeding and Genetic Traits

The 'cause' of a Shih Tzu's characteristics lies in the principles of genetics and selective breeding. For centuries, breeders intentionally paired dogs that exhibited the traits they wished to perpetuate. For the Shih Tzu, this meant selecting for:

• Coat: The long, double-layered coat was highly desirable, requiring significant grooming but adding to their regal appearance.
• Facial Structure: The short muzzle (brachycephalic) became a hallmark of the breed, contributing to their 'chrysanthemum' face. This trait, however, can also lead to certain health considerations.
• Size: They were bred to be small and portable, fitting comfortably on a lap.
• Temperament: An affectionate, outgoing, and companionable nature was crucial for a lap dog.

These desirable traits were passed down through generations via their DNA. Over time, this consistent selection process solidified the breed's characteristics, making them predictable and distinct from other dog breeds. The Shih Tzu breed standard, as recognized by kennel clubs today, is essentially a documented description of the traits that were intentionally cultivated through this historical breeding process.

The Breed's Near Extinction and Revival

Like many purebred dogs, the Shih Tzu lineage faced challenges. Following the fall of the imperial dynasty in China, the breed's numbers dwindled significantly. The political turmoil and societal changes led to the near extinction of the Shih Tzu by the early 20th century. Fortunately, dedicated breeders in both China and later in Europe and North America worked to revive the breed.

Importations of Shih Tzus from China to Europe and the United States in the early to mid-20th century were crucial for establishing and rebuilding the breed's population outside of its native land. These foundational dogs carried the genetic material necessary to restore the breed, ensuring that the unique combination of physical and temperamental traits would not be lost. The modern Shih Tzu is a direct descendant of these carefully preserved and reintroduced bloodlines.

Modern Shih Tzus: A Product of Their Past

Today's Shih Tzu is a direct descendant of these ancient Tibetan and Chinese lineages. Their breed 'cause' is their genetic heritage, shaped by the deliberate choices of breeders over centuries. Understanding their history reveals why they possess their distinctive looks, their affectionate personalities, and their predisposition to certain health conditions often associated with brachycephalic breeds.

When you see a Shih Tzu, you are looking at a living legacy of Tibetan monks, Chinese emperors, and dedicated breeders who aimed to create one of the world's most beloved companion dogs. Their existence is a fascinating example of how humans can influence the development of species through careful and consistent selective breeding practices.