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Medically self-reviewed by Dr. Sarah Mitchell, DVM — updated July 17, 2026. Dr. Sarah Mitchell is a small-animal veterinarian with a focus on feline preventive care with over 10 years of clinical experience. This is an author self-verification rather than an independent second-clinician review. The article is based on peer-reviewed veterinary research.

Genetic Origins: A Tale of Two Mutations

Cornish Rex Background

• Origin: Cornwall, England, 1950
• Founding Cat: Kallibunker—the result of a lucky natural mutation.
• Gene Type: Recessive; the Cornish Rex coat mutation is associated with LPAR6 (research on the Cornish Rex LPAR6 mutation).
• Body Type: Elegant, lithe, and built like a miniature Greyhound.
• Coat Texture: Short, silky fur arranged in tight "Marcel" waves.

Devon Rex Background

• Origin: Devon, England, 1960
• Founding Cat: Kirlee—another natural mutation found just ten years later.
• Gene Type: Recessive; the Devon Rex coat mutation is associated with KRT71, a different gene from the Cornish mutation (research on the Devon Rex KRT71 mutation; research on the Cornish Rex LPAR6 mutation).
• Body Type: Strong, muscular, and famously "pixie-like."
• Coat Texture: Soft, suede-like fur with loose, rippled waves.

The Big Secret: Even though they both look like curly little aliens, if you cross a Cornish Rex with a Devon Rex, you'll get a litter of straight-haired kittens. Evolution is funny like that—their curly coats are powered by completely separate genetic engines (Cornish Rex research; Devon Rex research).

Physical Characteristics: A Side-by-Side Look

Body Type Comparison

The Visual Cheat Sheet:

• Cornish Rex: Think sleek, high-fashion, and fast.
• Devon Rex: Imagine a charming, big-eared garden gnome or a tiny monkey.

Coat & Facial Features

Cornish Rex Coat:

• Texture: Feels like warm, crushed velvet.
• The Wave: Tight, uniform rows (the classic 1920s hairstyle).
• Shedding: Barely sheds at all. Reduced shedding does not make the Cornish Rex hypoallergenic: all cats produce allergens, and reactions vary with individual sensitivity and exposure. If allergies are a concern, spend time with the specific breed before committing. (ACAAI guidance on cat allergies; TICA Cornish Rex breed profile; TICA Devon Rex breed profile)

Devon Rex Coat:

• Texture: A bit more "open" and messy—more like a soft, rippled rug.
• The Wave: Loose and irregular waves.
• Shedding: Very low-maintenance and minimal shedding.

The Difference: The Devon Rex has those legendary low-set ears and a wide face that gives them their iconic "pixie" expression.

Temperament: The Clown vs. The Monkey

The Cornish Rex Personality

If you want a cat that will stay a kitten until its final days, this is it. The Cornish Rex has energy that simply doesn't quit — among the highest-energy breeds I see in practice, they consistently top the list. They aren't just affectionate; they are involved. Expect them to follow you from room to room like a shadow, chirping about their day. (TICA Cornish Rex breed profile)

Life with a Cornish:

• They are the undisputed clowns of the cat world.
• They are professional heat-seekers—if there's a sunny spot or a laptop keyboard, they'll find it.
• Highly intelligent. If you don't secure your cabinets, they'll learn how to open them.
• They love a good game of fetch and will ride around on your shoulders if you let them.

The Devon Rex Personality

The Devon Rex is often called a monkey in a cat suit. They are incredibly acrobatic, and in my own practice I see Devon owners reporting more curtain-climbing, shoulder-riding, and kitchen-counter inspections than with virtually any other breed I treat. A Devon doesn't just watch you cook; they want to sit on your shoulder and inspect the seasoning. (TICA Devon Rex breed profile)

Life with a Devon:

• These cats aren't just social; they are "in your business" 24/7.
• They are world-class jumpers and will find their way to the top of the fridge within seconds.
• Watch your snacks! Devons are notoriously food-obsessed and will try to share your dinner.
• They communicate with a unique vocabulary of chirps, trills, and soft mews.

Care & Grooming

Keeping Them Looking Good

• Brushing: Put the brush away. Their hair is too delicate. Use your hands or a soft cloth to groom them. (TICA Cornish Rex breed profile; TICA Devon Rex breed profile)
• Bathing: You might need to bathe them occasionally. Because they lack a traditional coat, skin oils can build up and make them feel a bit greasy. (TICA Cornish Rex breed profile)
• Ear Duty: Those massive ears are magnets for wax. Give them a gentle wipe once a week. (TICA Cornish Rex breed profile; TICA Devon Rex breed profile)

Important Realities

• Watch the Temp: Since they have very little fur, they get cold easily. Invest in some cat sweaters for the winter months. (TICA Cornish Rex breed profile)
• Sunburn is Real: If they spend too much time in a sunny window, their skin can actually burn. (TICA Cornish Rex breed profile)
• Brain Games: Boredom is the enemy. Both breeds need puzzle feeders, cat trees, and plenty of interactive toy time. (TICA Cornish Rex breed profile; TICA Devon Rex breed profile)

Health & Lifespan

Cornish Rex

• The Concerns: Keep an eye on heart health (HCM) and watch for patellar luxation (slipping kneecaps). (TICA Cornish Rex breed profile; ACVIM consensus statement on the classification, diagnosis, and management of cardiomyopathies in cats; Beer et al. on hindlimb conformation in cats with and without medial patellar luxation)
• Lifespan: 12–16 years.

Devon Rex

• The Concerns: Also prone to HCM. They have a specific hereditary condition called Devon Rex Myopathy (muscle weakness) that reputable breeders screen for. (TICA Devon Rex breed profile; study of hereditary myopathy in Devon Rex cats; ACVIM consensus statement on the classification, diagnosis, and management of cardiomyopathies in cats)
• Lifespan: 10–15 years.

From the exam room: In my own practice, the Rex breeds I see most often present for skin or ear complaints tied to their sparse coats — greasy ears, oily tails, or mild sunburn from a favorite window perch. My baseline recommendation for both breeds is an annual wellness exam with bloodwork and, once they reach adulthood, a screening echocardiogram before any planned anesthesia. Both breeds are athletic enough that a silent cardiac issue can go unnoticed until it isn't. (ACVIM consensus statement on the classification, diagnosis, and management of cardiomyopathies in cats)

Pros and Cons: Which One Wins?

The Cornish Rex

The Good: They are elegant, insanely devoted "Velcro cats" who will entertain you for hours. The Tough: They don't handle being alone well. If you work 12-hour days, they will get lonely and anxious.

The Devon Rex

The Good: They are hilarious, trainable, and look like they walked out of a fairy tale. The Tough: Their mischief is legendary. You'll need to "cat-proof" your house like you're preparing for a toddler.

So, do you want a slender, elegant shadow that treats life like a comedy show? Go with the Cornish. Or would you rather have a sturdy, acrobatic pixie that wants to share your lunch and ride on your head? Then the Devon is your cat. Either way, get ready for a house that is never, ever boring.

A Practical Fit Check

A breed comparison is most useful when you test it against your actual household. Before choosing:

• Meet the breed in person: TICA recommends visiting a cat show to connect with a breeder and help decide whether a Cornish Rex or Devon Rex is right for you. If allergies are a concern, spend time with the specific breed before committing; TICA's Devon Rex guidance recommends waiting at least 24 hours to see whether a reaction appears. (TICA Cornish Rex breed profile; TICA Devon Rex breed profile)
• Match the schedule: Both breeds are active and people-oriented. Plan regular interactive play and companionship, rather than assuming that a low-shedding coat means a low-maintenance lifestyle. (TICA Cornish Rex breed profile; TICA Devon Rex breed profile)
• Ask for health documentation: For a Devon Rex kitten, ask about testing for available genetic markers, including Devon myopathy, and whether the parents have been screened for HCM. (TICA Devon Rex breed profile; study of hereditary myopathy in Devon Rex cats)

Frequently Asked Questions

1. How much grooming do Cornish Rex and Devon Rex cats need?

Neither coat usually needs routine brushing: the TICA breed profiles describe the Cornish Rex as needing little grooming and the Devon Rex as often manageable with hand-over-coat grooming. Ears may need regular attention because wax or oily buildup can collect, and occasional bathing may be appropriate when a cat becomes greasy. (TICA Cornish Rex breed profile; TICA Devon Rex breed profile)

2. Are Cornish Rex or Devon Rex cats hypoallergenic?

No cat breed is truly hypoallergenic. All cats produce allergens, and reactions vary with individual sensitivity and exposure; low shedding may make some individual cats easier to live with, but it cannot guarantee a reaction-free home. If you have allergies, spend time with the specific breed before committing. (ACAAI guidance on cat allergies; TICA Cornish Rex breed profile; TICA Devon Rex breed profile)

3. What should I ask a breeder about Devon Rex myopathy?

Ask for documentation of genetic testing for available markers, including Devon myopathy, and ask whether the parents have been screened for HCM. Published research describes the condition as progressive muscle weakness, fatigue with exercise, and sometimes swallowing or esophageal problems; genetic testing can help owners and breeders identify affected cats and carriers. (TICA Devon Rex breed profile; study of hereditary myopathy in Devon Rex cats)

4. How much activity and company do these breeds need?

Both are active, social breeds. Plan for regular interactive play, climbing and puzzle opportunities, and human or animal company. TICA describes the Cornish Rex as athletic and the Devon Rex as active and people-oriented; both breed profiles caution that these cats should not be left alone for long periods. (TICA Cornish Rex breed profile; TICA Devon Rex breed profile)

5. How do Cornish Rex and Devon Rex coats differ genetically and visually?

The Cornish Rex has tight marcel waves and a coat mutation associated with LPAR6, while the Devon Rex has a looser, open wave and a coat mutation associated with KRT71. The mutations are distinct, so "Rex" describes a coat type rather than one shared breed lineage. (Cornish Rex LPAR6 study; Devon Rex KRT71 study; TICA Cornish Rex breed profile; TICA Devon Rex breed profile)

Medical Disclaimer: This article is for informational purposes only and does not constitute veterinary advice. Always consult a licensed veterinarian for guidance specific to your situation.

Sources Cited: This guide's breed, coat, care, temperament, and health references include the TICA Cornish Rex breed profile, TICA Devon Rex breed profile, Cornish Rex LPAR6 study, Devon Rex KRT71 study, Devon Rex hereditary myopathy study, ACVIM consensus statement on the classification, diagnosis, and management of cardiomyopathies in cats, Beer et al. on hindlimb conformation in cats with and without medial patellar luxation, and American College of Allergy, Asthma & Immunology guidance on pet allergies.

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