Sphynx

Lore & Background

Early breeders, including a science graduate of the University of Toronto and his mother Yania, along with Keese and Rita Tenhoves, worked to develop the breed, initially calling them 'Moonstones' and 'Canadian Hairless'. Meanwhile, in Minnesota, hairless barn cats appeared at the farm of Milt and Ethelyn Pearson in the mid-1970s. Two females, Epidermis and Dermis, were sold to Oregon breeder Kim Mueske and became important to the breeding program. The breed's hairlessness is caused by a mutation in the KRT71 gene, producing the 'hr' allele, which is incompletely dominant over the Devon Rex allele and recessive to the wild type.

Reader's Guide

The Sphynx cat holds significance as a distinct breed developed from natural genetic mutations, demonstrating how selective breeding can amplify a rare trait. Its hairlessness, due to a KRT71 gene mutation, makes it unique among cat breeds, though it shares genetic links with the Devon Rex and Selkirk Rex. The breed's history illustrates the challenges of early breeding programs, including fertility issues and the need for outcrossing. Sphynx cats are known for their extroverted behavior, high energy, and affection, often seeking warmth due to their lack of fur. Care requirements include protection from sunburn and cold, regular cleaning of skin folds and ears due to oil and wax buildup, and awareness that they are not necessarily hypoallergenic. The breed's legacy is one of a deliberately cultivated, hairless companion animal with a devoted following.

Did You Know?

• The Sphynx cat's skin has the texture of chamois leather and may be completely hairless or have fine hairs.
• The breed's hairlessness is caused by a mutation in the KRT71 gene, which also affects the Devon Rex and Selkirk Rex.
• Sphynx cats lose body heat more readily than coated cats, making them warm to the touch and prone to seeking warm places.

Origins: Two Lines of Hairless Kittens

The Sphynx breed traces its modern lineage to two separate discoveries of naturally hairless kittens in North America during the 1970s, though the story actually begins earlier. A University of Toronto science graduate, working alongside his mother Yania—a longtime Siamese breeder—and the Tenhove couple, initially marketed these cats as "Moonstones" or "Canadian Hairless" before the name Sphynx took hold. The second foundational line emerged in Wadena, Minnesota, where Milt and Ethelyn Pearson noticed hairless kittens appearing repeatedly among their domestic shorthair barn cats in the mid-1970s. Two females, Epidermis and Dermis, were sold to Oregon breeder Kim Mueske and became central to the breeding program. Hugo Hernandez bred them to a Devon Rex, producing kittens that further enriched the gene pool. Breeder Georgiana Gattenby in Brainerd, Minnesota, also contributed by outcrossing the Pearson line with Cornish Rex cats.

A Body Built for Warmth: Physical Characteristics

The Sphynx presents a striking silhouette that rewards close inspection. Its skin carries the texture of chamois leather, and while some individuals are entirely bare, others carry a fine down of hair. Whiskers may be fully present, partially broken, or absent altogether. The head is wedge-shaped with prominent cheekbones, large lemon-shaped eyes, and very large ears that bear hair on the inner surface and soft down at the outer base. The body is well-muscled and powerful, with a medium-length neck leading to a barrel-chested torso and a full, rounded abdomen that breeders sometimes call a pot belly. Legs are notably long, and the paws feature pads thicker than those of other cats, giving the impression of walking on cushions. The tail tapers like a whip from body to tip, occasionally sporting a tuft of fur at the end reminiscent of a lion's mane. Because the absence of a fur coat accelerates heat loss, Sphynx cats run warm to the touch and have a strong instinct to seek out heated surfaces. Their skin displays the same coloration a coat would carry, and every standard feline pattern—solid, point, van, tabby, tortoiseshell—can appear across their bare skin.

The Science of Bare Skin: Genetics

The Sphynx's signature hairlessness is rooted in a specific mutation within the KRT71 gene, a gene responsible for the keratinization of hair follicles. In most cats, KRT71 helps produce strong, securely anchored hair. In the Sphynx, however, a variant known as the "hr" allele causes a complete loss of that function. The resulting hair lacks a solid root or bulb, rendering it extremely fragile and loosely attached to the skin. The hair sheds readily, leaving the cat with only a whisper of soft down on the nose, tail, and toes. Both conditions stem from different alleles of the same gene. The Devon Rex carries the "re" allele, which leaves residual protein activity and produces short curly hair rather than full hairlessness. The Sphynx "hr" allele is incompletely dominant over the Devon allele, and both are recessive to the wild-type gene. The same KRT71 gene also underlies variations in the Selkirk Rex, though with yet different outcomes. This genetic architecture means the Sphynx is distinct from other hairless breeds such as the Peterbald and Donskoy, whose hairlessness is governed by entirely different genes.

Breeding a Breed: Challenges and Standards

Developing the Sphynx into a stable, reproducible breed was far from straightforward. The earliest breeders—the Bawas family and the Tenhoves in Toronto—were the first to identify that the hairlessness gene operates in an autosomal recessive pattern, and they translated that understanding into a working breeding program that produced kittens capable of reproducing. Early breeders admitted their knowledge of Sphynx genetics was vague, and they encountered numerous setbacks along the way. Today, the breed is recognized under different standards by major cat associations. The International Cat Association, the Fédération Internationale Féline, and the Cat Fanciers' Association each maintain their own specifications, and the Sphynx standard differs from those of other hairless breeds like the Don Sphynx and Peterbald. Outcrosses remain part of the breeding toolkit: the Devon Rex and Cornish Rex have both been used to strengthen the gene pool, and the Governing Council of the Cat Fancy permits the Russian Blue as an outcross. This ongoing genetic management ensures the breed's health and diversity while preserving its distinctive bare appearance.

Common Misconceptions (Editorial)

Some people believe that all Sphynx cats are completely hairless, but the facts note they may be completely hairless or have fine hairs. Others assume the breed was created entirely through human engineering, but the facts confirm that the hairlessness results from a naturally occurring genetic mutation that was then developed through selective breeding.

Why It Matters (Editorial)

The Sphynx endures as a testament to how natural genetic variation can be channeled into deliberate breeding programs, creating a breed that challenges conventional notions of what a cat should look like. Its striking appearance and unique physical needs—such as seeking warmth due to rapid heat loss—also inspire ongoing conversations about animal welfare and the responsibilities of breeding for distinctive traits.