The Chihuahua was discovered in Mexico in 1850 and is the smallest breed of dog in existence. The modern-day Chihuahua might have been a cross between the Chinese hairless and the Aztec Techichi dog. The breed was first registered in 1905.

Chihuahuas are tiny, they generally stand between 6 and 10 inches tall and weigh 3.3 to 6.6 pounds on average, although some can weigh up to 10 pounds. The Chihuahua has large eyes for its body and small, erect ears.

It can have one of two types of coat: long or smooth. The smooth name can be misleading, as the long-haired Chihuahua actually has a smoother coat, and the smooth coat tends to have short sometimes whiskery hair. The coat can come in a range of colors from fawn, to red, cream, chocolate, blue, black or white. The Chihuahua can also come in many patterns such as sable, Irish spotting, piebald spotting, extreme white spotting, brindle, masks, merle, and tan points.

The Chihuahua is a devoted breed with a large personality, albeit a small size. It can adapt to most environments and housing situations. With proper socialization and training the Chihuahua can make an excellent companion to an adult. They are not the perfect pet for children, however, since they tend to bite when frightened. As long as the child is old enough, the situation should be satisfactory. The Chihuahua tends to be very dedicated to its owner and can have a tendency to become jealous of anyone or anything else that receives attention from its owner. The breed also tends to have little to no concept of its own size and will confront larger creatures without hesitation, so it should be watched.

The Chihuahua may experience some health issues, as do most breeds. The breed requires expert care in the areas of birthing and dental care. The Chihuahua may also be prone to seizures, epilepsy, hydrocephalus, moleras, and hypoglycemia. Great care needs to be taken when feeding a Chihuahua, because an overweight Chihuahua may experience joint injuries, tracheal collapse, chronic bronchitis, and it can shave years off its life. The average lifespan for a Chihuahua is 8 to 18 years.

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