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The Chihuahua is the smallest dog breed in the world, named for the Mexican state where it was first documented. It comes in smooth and long coat varieties and a wide range of colors, and it packs an outsized personality into a body that fits in a handbag. It suits apartment dwellers, seniors, and owners wanting a portable, loyal companion, with the understanding that a dog this small calls for gentle handling and supervision.
Chihuahuas are alert, confident, and fiercely loyal, often bonding intensely with one person. They can be wary of strangers and other dogs and make surprisingly effective watchdogs, though they can be vocal. They are intelligent and trainable with patience and positive reinforcement. Early socialization matters more for this breed than most, since an undersocialized Chihuahua can become snappy or fearful.
The AKC standard calls for a weight not exceeding 6 lbs, with no height requirement, though most stand 5 to 8 inches at the shoulder. The term teacup is a marketing label for dogs bred at the very low end and is not a recognized size; the smallest dogs carry the highest health risk.
Smooth-coat Chihuahuas need only occasional brushing. Long-coat Chihuahuas need brushing several times a week to prevent tangles in the ear fringe, tail, and leg feathering. Both varieties shed moderately and are not hypoallergenic. Small mouths make dental care critical, and nails should be trimmed regularly.
Chihuahuas can inherit patellar luxation, tracheal collapse, mitral valve disease and other heart conditions, hydrocephalus, epilepsy, and progressive retinal atrophy. Dental crowding and periodontal disease are common because of the tiny jaw. Very small puppies are prone to hypoglycemia. Many Chihuahuas retain a soft spot on the skull, called a molera, into adulthood, which is normal for the breed but calls for care against head injury. Recommended parent testing includes patella evaluation, cardiac evaluation, and eye clearances.
Chihuahuas need only short daily walks and indoor play. They are ideal apartment dogs and should live indoors with the family. They are cold-sensitive and often need a sweater in winter. Because of their fragility they should be handled gently and supervised around young children and larger dogs.
Typical lifespan is 14 to 16 years, among the longest of any breed. Dental care, weight control, and protection from injury support a full life.
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