Life at Home

The World's Shortest Dog Is 3.59 Inches Tall. That's Not the Cute Part of the Story.

Pearl the Chihuahua is shorter than a popsicle stick, lighter than a basketball, and genuinely adorable. She is also the product of a cloning project, and the record she holds drives a market that hurts dogs.

By Nina Vasquez, Living Editor

April 13, 2023 · 5 min read

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Guinness World Records has a new shortest living dog, and she is objectively hilarious. Pearl, a two-year-old white Chihuahua, stands 3.59 inches tall and measures five inches long. Put a popsicle stick next to her and the stick wins. Put a dollar bill next to her and it is a fair fight. At birth she weighed under an ounce; today she is 1.22 pounds, which leaves her lighter than a basketball.

Her mom is Vanesa Semler, who works in law and property management in Orlando, and she says the size tells you nothing about the personality. Pearl is smart, she knows exactly how to get noticed, and she knows how to get what she wants. Her documented wants include chicken, salmon, Starbucks, television, classical music, and the right to select her own outfit each morning. She lives with several other dogs and refuses to share toys or food with any of them, and she barks to broadcast her disappointment and annoyance to a household that appears to have accepted this arrangement.

Her days are strictly managed. She wakes at 7 for a short, carefully supervised walk, which one assumes exists to prevent her from being carried off by a hawk or lost in medium-height grass. Meals arrive four times daily, and bathroom trips are spaced a few hours apart.

Her public debut came on the Guinness Italian series Lo Show Dei Record, where she was carried onstage in a basket built to look like an egg, before a live audience. Guinness remarked on her temperament, which runs far calmer than her breed’s reputation would predict: the crowd did not faze her in the slightest. Her mom’s assessment is that she is something of a diva who likes to be dressed well.

All of which is delightful. And all of which is why the rest of this story tends to get skipped.

Where Pearl actually comes from

The previous record holder was a Chihuahua named Miracle Milly, who stood 3.8 inches tall and died in 2020 at the age of nine.

Pearl never met her. She was born after Milly’s death, and Guinness describes her not as a random tiny dog who happened to turn up but as a direct relative: Pearl is the daughter of one of Milly’s identical sisters. Those sisters exist because Milly was cloned, 49 times over, in an effort to study the genetics behind her size.

That is a sentence worth sitting with. The world’s smallest dog is the offspring of a cloning program run on the previous world’s smallest dog. This is not a fluke of nature that a family stumbled into. It is a lineage that was, in a meaningful sense, engineered.

The record has a market attached to it

Here is the part that has nothing to do with Pearl, who is a real dog living a comfortable and rather glamorous life, and everything to do with the people who see her and want one.

“Teacup” is not a breed and it is not a size class recognized by any legitimate registry. It is a marketing word, and the way you reliably produce a dog small enough to earn it is by breeding runts to runts, generation after generation, selecting for a trait that in a healthy population would be a red flag. What that selection reliably produces, alongside the tiny dog, is a stack of problems:

Hypoglycemia. A dog with almost no body mass has almost no glucose reserve. Very small toy dogs can crash into a life-threatening low blood sugar simply by missing a meal or getting overexcited, which is why they eat four times a day.
Hydrocephalus. Fluid on the brain is meaningfully more common in the extremely small skulls these breeding programs produce.
Collapsing trachea. The windpipe cartilage in toy dogs is prone to flattening, producing the honking cough anyone who lives with a small dog will recognize. Walk them on a harness, never a collar.
Patellar luxation. Kneecaps that slip out of the groove, often needing surgery.
Fractures from ordinary life. A jump off the sofa is a broken leg. A misplaced foot is a catastrophe.
Dental disease. The same number of teeth, crammed into a much smaller jaw.

None of this is an argument against Chihuahuas, who are a robust, opinionated, long-lived breed when bred sensibly. It is an argument against buying a dog because of a number.

“Every time a record like this goes viral, we see the search traffic and then, a year later, we see the dogs,” says Dr. Mara Chen, a veterinarian on the Pet Times expert team. “Smaller is not a feature. Past a certain point it is a set of medical problems in a sweater, and the dog is the one who pays for the aesthetic.”

What to actually do with this

Enjoy Pearl. She is a genuinely charming animal with a strong personality and an excellent life, and there is no reason to be sour about a small dog in a basket on Italian television.

Then, if she made you want a very small dog, do the unromantic thing. Meet the parents. Ask what the adults weigh, and be suspicious of any breeder advertising “teacup,” “micro,” or a target adult weight under about four pounds. Ask about patellar and cardiac screening. Ask what happens when a puppy in the litter turns out to be too small to thrive.

Or, better: go to a shelter. Chihuahuas and Chihuahua mixes are among the most commonly surrendered dogs in the United States, and a great many of them are already extremely small, already charming, and already looking for someone to bring them a piece of chicken.

What’s new since this was written

Pearl has kept the title. Guinness still lists her as the shortest living dog, and she remains 9.14 cm (3.59 in) tall, 12.7 cm (5 in) long, and 553 g (1.22 lb).

What has changed is the conversation around how she got here. Milly’s cloning, once presented mostly as a scientific curiosity, now sits in the middle of a live debate about commercial pet cloning, an industry that has grown considerably and is still almost entirely unregulated. The dogs produced by it are healthy often enough to make headlines and unhealthy often enough that the process stays ethically contested.

Pearl is not a cautionary tale. She is a dog in a sweater. The industry she is a product of, and the demand she inadvertently generates, is where the caution belongs.