The Maine Coon guide · Kats Kits
Why Are Maine Coons So Big?
Maine Coons are big for several reasons at once. They come from a cold place where a large, sturdy body was an advantage, they are built long and heavy-boned under all that fur, they keep growing for years after most cats have stopped, and breeders have favored size and substance for generations. The thick coat then makes them look bigger still.
This guide is about the why. For the numbers, with adult weights and lengths and a growth chart by age, see how big Maine Coons get.
Did Cold Winters Make Maine Coons Big?
Very probably, at least in part. The breed took shape on farms in Maine, where winters are long, snowy and bitterly cold, and the cats spent much of their lives outdoors and in unheated barns. In that kind of climate a larger body has a real advantage: it has less skin surface for its weight, so it loses heat more slowly. Biologists see the same pattern across many warm-blooded animals, where populations in colder places tend to be bigger, an idea known as Bergmann's rule.
Nobody ran an experiment on Maine's farm cats, so this is an explanation rather than a proven fact. But the rest of the Maine Coon reads like a list of cold-weather gear, which supports it:
- A heavy, water-resistant coat, longest on the belly and legs, where snow and wet ground meet the cat.
- Big, round paws with tufts of fur between the toes, which spread the cat's weight on snow. Some lines also have extra toes; see polydactyl Maine Coons.
- A long, bushy tail that can be wrapped around the face and body when the cat curls up.
- Furnished ears, with long tufts inside that are thought to help keep out cold air.
How Did Farm Life Shape the Maine Coon's Size?
The Maine Coon's ancestors were working cats. They earned their keep catching rats and mice in barns, homes and ships, and they lived largely on what they caught. A strong, capable hunter that could get through a hard winter was more likely to live long enough to raise kittens, and those kittens inherited its build.
People probably helped too. Farmers had every reason to keep and feed their best mousers, and a big, bold cat that could tackle a large rat was worth more than a small, timid one. Nobody was breeding for size on purpose, but over many generations these pressures would have favored large, robust cats. The longer story is in where Maine Coon cats come from.
Is a Maine Coon Really Big, or Just Fluffy?
Both, but there is real size under the coat. A Maine Coon is built differently from an ordinary house cat:
- A long body. The breed standards ask for a long, rectangular body, and a Maine Coon is noticeably longer from chest to rump than most cats.
- Heavy bone. The legs are thick and solid and the frame is wide-set, with a broad chest.
- Muscle. A fit Maine Coon feels firm and powerful, not soft.
- A very long tail, which adds inches to any nose-to-tail measurement.
The coat does add to the effect. A full ruff and thick britches on the back legs make a Maine Coon look far bigger than it is, and a wet Maine Coon is a surprisingly slim cat. That is why weighing and feeling the body tell you more than looking. There is more on the breed's build in what a Maine Coon looks like.
Why Do Maine Coons Take So Long to Grow?
Slow growth is part of how a Maine Coon gets big. Most cats are close to adult size at about a year old. A Maine Coon grows fast in its first year, reaching much of its height and length, then keeps filling out until it is 3 to 5 years old, adding bone, muscle and coat. A longer growing period means more growing, which is likely one reason the breed ends up larger than cats that finish at a year.
It also explains why a young Maine Coon can surprise an owner expecting a giant. At 12 months many look leggy and narrow, and the broad chest, heavy head and full ruff come later. The stage-by-stage picture is in Maine Coon kitten growth stages.
Why Are Male Maine Coons So Much Bigger?
In most cat breeds males are bigger than females, and in Maine Coons the gap is wide: grown males usually weigh 13 to 18 pounds and females 8 to 12. Males also tend to have broader heads, heavier bone and a fuller ruff, and they often keep developing for longer.
Neutering does not erase the difference. A male neutered as a kitten still grows into a bigger cat than his sisters, because the size gap comes from genes as well as hormones. If a large cat matters to you, a male is the safer choice, but personality is the better reason to pick a kitten.
Do Food and Neutering Make a Maine Coon Bigger?
Food lets a Maine Coon reach the size its genes allow, and no further. A kitten needs a good, high-protein kitten diet through its first year, and an underfed or sickly kitten may never reach its full frame. But extra food does not build extra bone. Once the frame is set, surplus calories become fat, and a heavy Maine Coon is not a big one, just an overweight one. Feeding guidance is in what Maine Coons eat.
Neutering is less clear-cut. Sex hormones help signal the growth plates in the long bones to close, so a cat neutered young may keep growing in length a little longer, and some people think early-neutered cats end up slightly taller. Any effect seems small. The bigger change is that a neutered cat burns fewer calories and gains weight more easily, so ask your vet about timing and portions.
Have Breeders Made Maine Coons Bigger?
Breeders have certainly favored size. The breed standards describe a large, solid, rectangular cat, and generations of choosing the most impressive cats for breeding and showing have kept the Maine Coon at the large end of the cat world. The standards also ask for balance and proportion, though: a big cat with a well-made frame, not a heavy one.
Some sellers go further and advertise "giant" lines as if they were a separate, larger kind of Maine Coon. They are not, and no one can promise a kitten's adult weight. An overfed cat is not a giant either, just a heavy one, with a higher risk of joint trouble in a breed already prone to hip dysplasia, and extra weight is linked to a shorter life; see Maine Coon lifespan. A lean, well-muscled Maine Coon is the real thing, whatever its size.
Is a Maine Coon Bigger Than a Ragdoll, Norwegian Forest Cat or Savannah?
The large breeds overlap a lot, and individual cats vary more than the averages suggest. These are rough typical ranges for grown cats; sources differ, and plenty of cats fall outside them.
| Breed | Typical male | Typical female | Build |
|---|---|---|---|
| Maine Coon | 13 to 18 lb | 8 to 12 lb | Long, rectangular and heavy-boned, with a very long tail |
| Ragdoll | Roughly 12 to 20 lb | Roughly 8 to 15 lb | Large and heavy for its length, with a soft, plush build |
| Norwegian Forest Cat | Roughly 12 to 16 lb | Roughly 8 to 12 lb | Sturdy, with hind legs a little longer than the front |
| Siberian | Roughly 10 to 17 lb | Roughly 8 to 12 lb | Rounded, compact and powerful |
| Savannah | Varies widely by generation | Varies widely by generation | Tall, long-legged and lean; a hybrid of the domestic cat and the African serval |
- Maine Coon or Ragdoll? Close on weight. The Maine Coon is usually the longer, taller cat, while a Ragdoll often weighs more than it looks.
- Maine Coon or Norwegian Forest Cat? The Maine Coon is usually the bigger of the two, though a large Norwegian male can match a small Maine Coon.
- Maine Coon or Savannah? An early-generation Savannah can stand taller at the shoulder, but it is lighter-boned and leaner. Later generations are often closer to an ordinary house cat in size.
To tell these long-haired breeds apart by their heads and coats, see how to tell if your cat is a Maine Coon.
Is the Maine Coon the Largest Cat Breed?
It is generally counted as the largest domestic breed that is not a wild hybrid, mainly because of its length and frame. A few qualifications:
- Weight overlaps. Ragdolls, and some Siberians and Norwegian Forest Cats, can weigh as much as a Maine Coon, and a heavy cat of any breed can outweigh a light Maine Coon.
- Hybrids can be taller. Savannahs, which have a wild serval in their ancestry, can stand taller at the shoulder, especially in early generations.
- Length is where Maine Coons stand out. The biggest Maine Coon on record is a long one: Stewie, recognized by Guinness World Records in 2010 as the longest domestic cat, measured 48.5 inches from nose to tail tip.
That record is a long cat rather than a heavy one, which is as it should be. If you would like a Maine Coon of your own, see the Maine Coon kittens available now.
Quick Answers
Are Maine Coons bigger than ordinary house cats?
Yes. A typical house cat weighs somewhere around 8 to 10 pounds, while a grown male Maine Coon usually weighs 13 to 18, and the breed is longer and heavier-boned as well.
Why is my Maine Coon small?
It may still be growing, since Maine Coons fill out until 3 to 5 years old. Some, especially females and cats from smaller lines, simply stay at the lower end of the range, which is perfectly healthy; your vet can check that growth is on track.
Are European Maine Coons bigger?
Not reliably. Lines sold as European Maine Coons are bred for a more dramatic head and ears, but they are the same breed, with the same range of sizes.
Do Maine Coons get big because they eat more?
No. A big Maine Coon eats more because it is big, not the other way around. Extra food only adds fat to a frame that genetics has already set.
Is a Maine Coon bigger than a Siberian?
Usually, in length and height. A Siberian is a compact, heavy cat that can weigh nearly as much, but it is typically shorter in the body and tail.
Are polydactyl Maine Coons bigger?
No. Extra toes make the paws look broader, like mittens, but they do not change the size of the cat.
