31/07/2026
Why Is a Hairless Xolo Not Completely Hairless?
If Xoloitzcuintlis are a hairless breed, why do they still have a mohawk, "socks" on their paws, and a tuft on the tip of their tail?
The answer lies in genetics.
Hairlessness in Xolos is caused by a unique mutation in the FOXI3 gene. However, this gene doesn't completely "switch off" all hair follicles. Instead, it changes the way they develop. That's why Xolos are not truly hairless.
The hair that remains is typically found on the head, paws, and the tip of the tail. This is completely natural and is exactly what the international breed standard describes.
Why does hair remain in these specific areas? Science still doesn't have a definitive answer. Researchers believe that during embryonic development, the FOXI3 mutation affects different parts of the skin in different ways, allowing some hair follicles to remain active.
Here's another fascinating fact: the number of hair follicles does not change throughout life. A Xolo doesn't "grow more hair" or "lose hair" as it matures. The follicles it is born with are the same ones it will have for life.
So why does the mohawk look different as the puppy grows?
It's simple: the head grows larger, while no new hair appears. As the skin expands, the existing hair is spread over a larger surface, making the mohawk appear narrower, cleaner, and more defined with age.
Interestingly, the FOXI3 gene is not unique to Xolos. Humans have it too. This gene is involved in the development of hair, skin, teeth, and other tissues in many mammals, which is why it has attracted the attention of geneticists around the world for many years.
Humans aren't completely hairless either. We have hair over almost our entire bodies, but most of it is extremely fine and barely visible. In Xolos, the FOXI3 mutation changes this natural distribution, leaving hair mainly on the head, paws, and tail.
So the Xolo's mohawk isn't a fashion statement or an unusual quirk of an individual dog. It's a visible reminder of one of the most fascinating genetic traits found in the canine world.
And perhaps it's exactly these little details that make us fall in love with Xolos over and over again.
