Cat Breed Comparison
Korat vs Russian Blue: Key Differences
Korat and Russian Blue are often confused. Compare their size, weight, lifespan, origin, temperament, and health — and learn how to tell them apart at a glance.
Quick Comparison
| Trait | Korat | Russian Blue |
|---|---|---|
| Size | Small to Medium | Medium |
| Weight | 6–10 lbs (2.7–4.5 kg) | 7–12 lbs (3–5.5 kg) |
| Lifespan | 12–15 years | 12–17 years |
| Origin | Thailand | Russia (Arkhangelsk region) |
Visual Differences
Telling a Korat from a Russian Blue
Russian Blues have a wedge-shaped head, a svelte foreign-type body on long legs, and a double coat that stands away from the body in thick plush layers. Korats have a heart-shaped head, a compact muscular body (not svelte), and a fine single coat that lies flat against the body with silver tipping. The Russian Blue has vivid green eyes; the Korat has luminous peridot-green eyes that look larger in proportion to the face.
Korat Key Markers
- Short, fine single coat in a clear silver-blue — the CFA standard describes it as "one color over the entire body, a silver-blue without shading or markings of any kind"; the guard hairs are silver-tipped, giving the coat a distinctive shimmering or "halo" effect when the cat moves; the coat lies close and glossy without undercoat
- Heart-shaped head — a unique feature described in the CFA standard: the head forms a heart shape when viewed from the front, with the width across the eyebrows creating the top curves and the muzzle forming the point; the forehead is high and broad, and the muzzle is well-developed but not wedge-shaped
- Large, luminous, brilliant green eyes — exceptionally large for the face, giving the Korat its distinct wide-eyed, innocent expression; kittens are born with amber or golden eyes that transition to green by around 2-4 years of age, with the final color being a vivid, luminous green described as "peridot green"
Russian Blue Key Markers
- Short, dense double coat in a clear even blue-gray — each hair has silver-tipped guard hairs that create a shimmering, iridescent effect; the coat stands away from the body (does not lie flat) and feels like thick plush velvet or silk; CFA calls it "short, dense, fine, and plush — standing up from the body"
- Wedge-shaped head with a flat skull and a long straight nose — the profile has a gentle break at eye level; the muzzle is short but the whisker pads are prominent, giving the face a distinct "smiling" expression
- Large, wide-set vivid green eyes in the shape of an almond laid on its side — kittens are born with yellow eyes that turn a distinct emerald green by 4 months old; the green is striking against the blue-gray coat
Temperament & Personality
Korat
- Highly intelligent and observant — learns daily routines, responds to its name, opens doors, and develops strong interactions with family members; described as having an "almost human" understanding of household activities
- Loyal and affectionate with their family — forms deep attachments and follows chosen people from room to room; described as "wanting to be a part of everything you do"; very sensitive to praise or scolding
- Reserved with strangers — the Korat is wary of unfamiliar people and new situations; will likely hide when visitors arrive and emerge only after the environment has calmed; needs patient introductions to new people
- Sensitive to change and loud environments — not a cat for chaotic or noise-heavy homes; loud voices, arguments, or frequent guests stress the Korat and can lead to physical symptoms like over-grooming or loss of appetite
- Playful and athletic — enjoys climbing, chasing, and interactive games; the breed has surprising speed and jumping ability despite its compact size; stays playful throughout life
- Quiet voice — the Korat is not a vocal breed; communicates through soft meows, purrs, and strong eye contact; the breed is much quieter than Siamese or Oriental Shorthairs
- Does not do well alone — Korats need a companion (human or another cat) if the household is empty for long hours; they can become depressed and withdrawn when left alone for extended periods
Russian Blue
- Intelligent and observant — watches household routines and learns patterns; opens doors, turns on taps, and responds to its name
- Reserved with strangers — hides when visitors come, then emerges to inspect from a distance once the house is quiet
- Fiercely devoted to their family — follows their person, sleeps under the covers, demands head bumps and cheek rubs on their own terms
- Sensitive to change and loud environments — research places the breed among the least adaptable to multi-cat households, boarding, or renovation noise; best in calm, predictable homes
- Quiet — meows rarely and softly; communicates through body language, eye contact, and gentle head-butting
- Playful but not destructive — enjoys chasing, fetching, and puzzle feeders but will entertain itself quietly when no one is available to play
- Appreciates high perches — likes to be above the action, watching from cat trees or shelves rather than being on the floor in the middle of activity
Health Notes
Korat
- Gangliosidosis (GM1 and GM2) — a fatal inherited lysosomal storage disorder found in the Korat breed; caused by a deficiency in beta-galactosidase (GM1) or beta-hexosaminidase (GM2) enzymes, leading to progressive neurological deterioration; symptoms appear at 3-8 months of age: tremors, incoordination, hyperesthesia, and eventually paralysis; no treatment or cure exists; a DNA test identifies carriers and affected cats; responsible breeders test all breeding cats and do not breed carriers together
- Hypertrophic cardiomyopathy (HCM) — reported in the breed; the Korat’s small gene pool means genetic heart disease can spread quickly; regular echocardiogram screening recommended for breeding cats; annual checkups with cardiac auscultation for all Korats
- Feline lower urinary tract disease (FLUTD) — moderate predisposition; the breed’s sensitivity to stress can trigger stress-related cystitis; high-moisture diet, stress management, and multiple litter boxes positioned in quiet areas are preventive measures
- Dental disease — the compact muzzle structure contributes to some tooth crowding; regular dental care and annual oral exams recommended; the Korat’s small jaw means missing or crowded premolars are not uncommon
- Sensitivity to anesthesia — all cats with compact body types and low body fat need careful anesthetic protocols; discuss with a veterinarian before any surgical procedure; pre-anesthetic bloodwork is essential
Russian Blue
- Feline lower urinary tract disease (FLUTD) — Russian Blues show a higher-than-average predisposition to bladder stones and urinary tract inflammation; the breed’s calm stress-reactive nature may contribute to stress-triggered cystitis; high-moisture diet and stress management are key preventive measures
- Obesity — the breed’s moderate activity level and love of food can lead to weight gain; the fine-boned body frame makes even extra ounces noticeable on their silhouette
- Hypertrophic cardiomyopathy (HCM) — reported in the breed, though at lower incidence than in Maine Coons or Ragdolls; regular cardiac screening recommended for breeding cats
- Dental disease — narrow muzzle structure contributes to tooth crowding and gingivitis risk; regular dental care recommended
- Sensitivity to anesthesia — all svelte-type breeds with low body fat have a narrower anesthesia safety margin; discuss with a veterinarian before any surgical procedure
This information is for educational purposes only. Always consult a veterinarian for health advice specific to your cat.
Frequently Asked Questions
How can I tell a Korat apart from a Russian Blue?
Russian Blues have a wedge-shaped head, a svelte foreign-type body on long legs, and a double coat that stands away from the body in thick plush layers. Korats have a heart-shaped head, a compact muscular body (not svelte), and a fine single coat that lies flat against the body with silver tipping. The Russian Blue has vivid green eyes; the Korat has luminous peridot-green eyes that look larger in proportion to the face.
Are Korat cats hypoallergenic?
No — Korats are not hypoallergenic. Their single coat sheds less than double-coated breeds, but they still produce the Fel d 1 allergen in normal amounts.
When do Russian Blue kittens’ eyes turn green?
Russian Blue kittens are born with yellow eyes that gradually shift to a vivid emerald green, usually by about 4 months of age. If an adult cat’s eyes are still yellow, orange, or copper, it is likely not a pure Russian Blue.
Not Sure Which Breed Your Cat Is?
Upload a photo to Furriq's free breed identifier and let AI check 40+ visual markers in seconds — no sign-up, no storage.
Breed Profiles & More Comparisons
Korat
A blue-gray cat from Thailand with a heart-shaped face, luminous green eyes, and a silver-tipped coat that shimmers like rain clouds. The Korat is one of the oldest naturally occurring cat breeds, cherished in Thailand as a "good luck cat" for centuries. Intelligent, loyal, and sensitive, Korats form deep bonds with their families and dislike living in homes where people are gone for long hours.
Russian Blue
A blue-gray short-hair with a shimmering silver sheen and vivid green eyes. Russian Blues are reserved with strangers but deeply affectionate with their own people — quiet, gentle, and sensitive. The breed’s double coat stands up from the body, giving the cat a plush, velvety feel that cat breeders call "the smile under the hand."