The Chihuahua (or “Chi”) is the classic “big dog in a small package.” Weighing no more than a few pounds, they fear nothing. They will challenge dogs ten times their size, bark at delivery trucks, and act as the self-appointed emperors of their households. To a Chihuahua, size is just a state of mind.

But behind the sass and the bluster is a dog that is intensely affectionate and devoted. Chihuahuas bond deeply with a single person and want nothing more than to be carried, cuddled, and adored. They are the ultimate “portable” companion, ideal for city living and travel, provided you are willing to give them the respect (and the warm lap) they demand.

History and Origin: The Sacred Dog of the Aztecs

The Chihuahua’s history is shrouded in mystery, but they are undoubtedly Mexican. They are named after the Mexican state of Chihuahua, where they were discovered by American tourists in the late 1800s.

• The Techichi: Genetic evidence links the modern Chihuahua to the Techichi, a small, mute companion dog kept by the Toltec civilization in Mexico as far back as the 9th century.
• The Aztec Era: When the Aztecs conquered the Toltecs, they adopted the Techichi. The dogs became integral to Aztec society. They believed the dogs had mystical powers, including the ability to see the future, heal the sick, and guide the soul of the dead through the underworld to the afterlife. Because of this, Techichis were often buried with their owners.
• Survival: After the Spanish conquest destroyed the Aztec civilization, the little dogs likely survived in remote villages, eventually evolving into the modern Chihuahua.

Physical Characteristics: The World’s Smallest Dog

The Chihuahua is the smallest recognized dog breed in the world.

• Weight: There is no minimum weight, but they must not exceed 6 pounds (2.7 kg) for the show ring. However, many pet Chihuahuas are larger (“deer types”) and weigh 8-10 pounds or more.
• Height: 5–8 inches (12-20 cm).

Coat Types

The breed comes in two distinct varieties:

1. Smooth Coat: The coat is short, shiny, and close-fitting. It feels like polished silk.
2. Long Coat: The coat is soft and flat or slightly wavy. It features “fringing” on the ears and a luxurious plumed tail that looks like a fan.

The Head Shape

• Apple Head: The breed standard calls for a round “apple” shaped skull with a short muzzle and a distinct 90-degree stop.
• Deer Head: A common variation (though not the show standard) with a longer snout and flatter skull. These dogs often have fewer health issues than extreme apple heads.
• The Molera: Many Chihuahuas are born with a soft spot on their skull (like a human baby), called a molera. It is a unique breed trait, though care must be taken to protect the head from injury.

Temperament and Personality

“Saucy” is the word most often used to describe them. “Napoleon Complex” is another.

The Guardian

Chihuahuas are alert watchdogs. They hear everything. They will bark at anything suspicious (or not suspicious, like a leaf falling). Without training, they can become “yappy.” They can also be aggressive toward strangers if not socialized, a syndrome known as “Small Dog Syndrome” where owners allow bad behavior because the dog is cute.

The One-Person Dog

They tend to pick a favorite human and can be possessive of them. They are happiest when burrowed under a blanket next to (or on top of) their person. They are “Velcro dogs” who hate being alone.

Fragile but Feisty

Because they are so small, they are easily injured. A fall from a sofa can break a leg. They are generally not recommended for families with young children, as a toddler can accidentally hurt a Chi simply by playing too rough or dropping a toy on them. And a frightened Chi will bite to defend himself.

Training and Exercise Needs

Exercise: Surprisingly Active

Contrary to popular belief, they do need exercise. They are not satisfied just being carried in a purse.

• Daily Needs: A short daily walk and indoor play are sufficient.
• Cold Weather: Chihuahuas have a high metabolism and lose body heat quickly. They have very little body fat. If it is cold, they need a sweater. If it is snowing, they will likely refuse to go outside.

Training: Small Dog, Big Rules

Many owners skip training because the dog is small. Do not do this. An untrained Chihuahua is a terror who will rule your house.

• Housebreaking: This is the #1 challenge. Their bladders are tiny, and they hate cold/wet weather. Consistency is key. Many owners use pee pads or litter boxes for bad weather days.
• Socialization: Carry them everywhere as puppies so they learn not to fear the world. A fearful Chihuahua is a snappy Chihuahua.

Health and Lifespan

Chihuahuas are incredibly long-lived, often reaching 15 to 20 years. They are one of the longest-lived breeds.

• Luxating Patella: Loose kneecaps that slip out of place. This is very common.
• Dental Disease: Their tiny mouths are crowded with teeth. You must brush their teeth daily, or they will rot and fall out.
• Hypoglycemia: Low blood sugar. This is a danger for tiny puppies. They need to eat small, frequent meals to keep their energy up.
• Tracheal Collapse: The windpipe is fragile. Use a harness, never a collar, for walking.
• Hydrocephalus: Fluid on the brain (more common in Apple Heads with large moleras).

Grooming and Care

• Smooth Coat: Wash-and-go. Occasional brushing with a rubber mitt.
• Long Coat: Needs brushing 2-3 times a week to prevent tangles behind the ears and under the legs.
• Nails: Their nails grow fast and need frequent trimming. Long nails can twist their tiny toes.
• Tearing: Their large, prominent eyes often tear, causing staining. Wipe the face daily.

Is a Chihuahua Right for You?

The Chihuahua is proof that size doesn’t matter.

Yes, if:

• You want a dog you can take everywhere. They fit in a bag and under a seat.
• You live in a small apartment. They don’t need a yard.
• You want a companion who will worship you. Their loyalty is absolute.
• You don’t have small children. You have a quiet, adult home.

No, if:

• You want a quiet house. They bark. A lot.
• You don’t want to deal with difficult potty training. Accidents happen.
• You want a “tough” dog. They are physically fragile.
• You are not prepared for a 20-year commitment. They live a long time.

The Chihuahua has the heart of a lion and the loyalty of a knight, all wrapped up in a package small enough to fit in a teacup. He demands respect, he steals warmth, and he will love you fiercely for two decades.