The Maine Coon is the largest domestic cat breed in the world — and one of the most charismatic. Their muscular build, tufted ears, bushy raccoon-like tail, and luxurious semi-long coat give them a wild, majestic appearance that belies their gentle, playful temperament. Often called “gentle giants” and “dog-like cats,” Maine Coons form deep bonds with their families, enjoy interactive play well into adulthood, and bring an extraordinary combination of size, intelligence, and warmth to a household. They also carry several well-characterised genetic conditions for which DNA testing is available.
Quick Facts
| Characteristic | Detail |
|---|---|
| Size | Large–very large (males: 6–10+ kg; females: 4–7 kg) — full size at 3–5 years |
| Coat | Semi-long, water-resistant double coat — 2–3× weekly brushing |
| Lifespan | 12–15 years |
| Temperament | Gentle, playful, intelligent, sociable — “dog-like” behaviour |
| Good for families? | Excellent — sociable with children, dogs, and other cats |
| Indoor/outdoor? | Can be both; many owners provide catios or secure gardens |
| Kitten cost (UK 2026) | £400–£1,600 |
Health — Key Conditions
HCM — Hypertrophic Cardiomyopathy
HCM is the most significant health condition in Maine Coons — but uniquely, the responsible gene has been identified:
- The MYBPC3 gene mutation causes thickening of the heart walls
- DNA test available — both parents should be tested. Ask breeders for HCM DNA test certificates
- Cats with one copy of the mutation have increased risk; cats with two copies have significantly higher risk and earlier onset
- Even DNA-clear cats should ideally have periodic echocardiogram screening, as other HCM-causing mutations may exist
SMA — Spinal Muscular Atrophy
SMA causes progressive muscle wasting due to motor neuron degeneration:
- Symptoms appear at 3–4 months: unsteady gait, hindquarter swaying, muscle weakness — particularly in rear legs
- Not fatal — affected cats can live comfortable lives but with reduced mobility and muscle mass
- Inheritance: autosomal recessive. DNA test available — both parents should be tested
Hip Dysplasia
More common in large cat breeds. The hip joint develops abnormally, causing pain, limping, and reduced activity. X-ray screening of breeding cats is recommended. Maintain lean body weight and provide steps/ramps to reduce jumping impact.
PKD — Polycystic Kidney Disease
A minority of Maine Coons carry PKD. DNA test available — ask breeders for PKD-negative test results.
Grooming
Maine Coons’ semi-long, water-resistant double coat requires consistent maintenance:
- Brush 2–3 times per week (10–15 minutes per session) with a slicker brush and wide-tooth comb
- Focus on mat-prone areas: armpits, belly, behind ears, tail base
- Start grooming as a kitten — early habituation makes adult grooming far easier
- Professional grooming generally not required if home brushing is consistent
FAQs
How big do Maine Coons actually get?
Males typically reach 6–10 kg, with exceptional individuals exceeding 12 kg. Females are noticeably smaller (4–7 kg). Crucially, Maine Coons grow very slowly — they don’t reach full size until 3–5 years old, so a 1-year-old Maine Coon is still a kitten in body composition. Be wary of breeders advertising “giant” Maine Coons — extreme size selection can amplify health problems including hip dysplasia and HCM. A healthy Maine Coon is a proportionate one.