Smallest breed dog

Do you know who was the smallest dog in history? Do you know what breed this dog is? To answer these questions this post will talk about the smallest dogs in the world. Topics such as the breed history of these dogs, physical and behavioral characteristics will be addressed.

Who is the smallest dog in the world?

A female dog called Miracle Milly, the Chihuahua was named the world’s smallest dog by Guinness World Records in 2013 at 9.65 cm (3.8 in) tall. Miracle Milly lives in Dorado, Puerto Rico with her tutor Vanesa Semler.

Miracle Milly is a sweet, adorable and very friendly dog ​​who loves to take pictures with her mini tongue out. The dog was born in December 2011 and continues to amaze people with her sweetness to this day.

The first dog to have the title of smallest in the world was the male Yorkshire called Big Boss at 11.94 cm (4.7 in) tall. Followed by the female Danka, the long haired Chihuahua, measured 13.8 cm (5.4 in) tall. 

Before Miracle, the title of smallest dog in the world was owned by Boo Boo, also a chihuahua, measuring 10.16 cm (4 in) tall.

About the Chihuahua breed

One of the theories about the origin of the Chihuahua believes that these dogs lived wild in Mexico. These small dogs were captured and domesticated by the indigenous people of the region.

Physical characteristics

The head is very round and small, and the eyes are round. The ears are large and are always on alert. It is a dog with a compact body, short and muscular limbs, its tail is moderately long, carried high, arched or in a semicircle.

The Chihuahua’s coat can be short-haired or long-haired and can be found in many shades and combinations except for the merle color.

Behavior / Temperament

Chihuahuas have a strong personality. They are small dogs but agile, alert, restless and very courageous. It’s a dog that can bark a lot. They can react to any strange movement, always calling the tutor’s attention. Therefore, it is considered a good guard dog.

Breed health

Chihuahuas are very healthy animals, but they need to do physical activities such as playing and going for walks to burn off some energy. This breed can have some genetic diseases such as:

  • Patellar deviation;
  • Cryptorchidism;
  • Hydrocephalus.

Patellar deviation is a disease where the animal may limp and feel local pain, as the patella leaves the anatomical place, which may lead to injuries from temptation and other complications.

Cryptorchidism is the disease present in males where one or both testicles are not observed in the scrotum. The puppies are born with the testicles in the cavity and until 8 months these testicles tend to be in the scrotum.

After 8 months of the absence of one or more testicles the animal is considered cryptorchid. In these cases, castration of the animal is indicated, since the testicle in the cavity has a greater predisposition to become a tumor that can worsen the health of the animal.

Hydrocephalus, on the other hand, has no well-described causes. It is the disease that happens in the intra uterine life where there is a large accumulation of liquids in the puppy’s skull. Thus, the bitch may have difficulties when giving birth to the animal in a natural way, being a necessary cesarean section. Puppies often die due to neuronal complications generated by hydrocephalus.

Dogs with these genetic disorders are discouraged from breeding. And there must be veterinary monitoring for better resolution of the cases.

These animals do not have so many reproductive problems, but gestational follow-up with a veterinarian is advised due to the high incidence of hydrocephalus, which can lead to dystocia, resulting in the mother and the offspring’s death.

Animals must have a routine of being vaccinated and dewormed. In addition to care with ectoparasites such as fleas and ticks. When these preventive cares are not applied, the animals can present health problems.

Illness, happiness, excitement, or fear can cause the animal to shiver, this same sign can be seen when they are cold. If constant tremors are observed, a veterinarian should be sought.

General Care

Short-haired dogs do not need clipping, while long-haired animals may need clipping. Bathing these animals must be done constantly and they must have their fur brushed at least twice a week.

Baths in this breed are indicated with specific shampoos for dogs and neutral shampoos. Bathing should be done very carefully, especially to avoid getting water into the ear. The animal must always be very dry after bathing to avoid the growth of microorganisms that can lead to dermatitis.

Brushing the dog’s teeth is necessary to prevent tartar buildup. Brushing the teeth should be done every 48 hours, using specific toothpaste for dogs. As for nail clipping, the nail should be cut once or twice a month. Cutting the nails prevents the animal from getting hurt or even hurting the tutor.


In this blog post we got to know a little about Miracle Milly, the smallest dog in the world and some characteristics of its breed. Chihuahuas are small dogs that can have short or long hair, they are courageous and alert dogs, making them an excellent companion and guard dog. Chihuahuas are healthy dogs, but very electrical, requiring physical activities and play. General care with the fur, skin, teeth and nail are necessary to keep the animal as healthy as possible.

Frequently Asked Questions (FAQs): The smallest dog in the world


How heavy is a chihuahua?

The Chihuahua’s weight should be between 1 and 3 kg.

How long does a chihuahua live?

Chihuahuas usually live between 12 and 20 years, depending on their genetics and general care.

Does the chihuahua bark a lot?

Yes, because they are dogs that have great hearing and any noise they find suspicious they will bark. Thus making them good dogs to guard.


CBKC – Brazilian Canine Confederation, 2015 Official Breed Standard: chihuahua. Available at:, accessed January 22, 2022.

The Guinness book of world records. (2016). Stamford, CT: Guinness Media.

Pictures from