The Maine Coon is a large domesticated cat breed. It has a distinctive physical appearance and valuable hunting skills. It is one of the oldest natural breeds in North America. The breed originated in the U.S. state of Maine, where it is the official state cat.
No records of the Maine Coon's exact origins and date of introduction to the United States exist, so several competing hypotheses have been suggested, the most credible suggestion being that it is closely related to the Norwegian Forest cat and the Siberian. The breed was popular in cat shows in the late 19th century, but its existence became threatened when long-haired breeds from overseas were introduced in the early 20th century. The Maine Coon has since made a comeback and is now the third most popular pedigreed cat breed in the world.

 The breed's colors vary widely, with only lilac and chocolate disallowed for pedigree. Prized for its intelligence and playful, gentle personality, the Maine Coon is often cited as having "dog-like" characteristics.

Origin

The ancestral origins of the Maine Coon are unknown—there are only speculation and folk tales. One story involves Marie Antoinette, the Queen of France who was executed in 1793. The story goes that before her death, Antoinette attempted to escape France with the help of Captain Samuel Clough. She loaded Clough's ship with her most prized possessions, including six of her favorite Turkish Angora or possibly Siberian cats. Although she did not make it to the United States, all of her pets managed to reach the shore of Wiscasset, Maine, safely, where they bred with other short-haired breeds and developed into the modern breed of the Maine Coon.

Description

The Maine Coon is a large and sociable cat, hence its nickname, "the gentle giant." It is characterized by a prominent ruff along its chest, robust bone structure, rectangular body shape, an uneven two-layered coat with longer guard hairs over a silky satin undercoat, and a long, bushy tail.

Markings

The Maine Coon is a long- or medium-haired cat. The coat is soft and silky, although texture may vary with coat color. The length is shorter on the head and shoulders and longer on the stomach and flanks, with some cats having a leonine ruff around their neck. Minimal grooming is required for the breed compared to other long-haired breeds, as their coat is mostly self-maintaining owing to a light-density undercoat. The coat is subject to seasonal variation, with the fur being thicker in the winter and thinner during the summer.
Maine Coons can have any colors that other cats have. Colors indicating crossbreeding, such as chocolate, lavender, the Siamese pointed patterns or the "ticked" patterns, are not accepted by some breed standards. This is not universal; the ticked pattern, for example, is accepted by TICA and CFA. The most common pattern seen in the breed is the brown tabby. All eye colors are accepted under breed standards, with the exception of blue or odd eyes, i.e. heterochromia iridium, or two eyes of different colors, in cats possessing coat colors other than white.
Habits

Maine Coons have several physical adaptations for survival in harsh winter climates. Their dense water-resistant fur is longer and shaggier on their underside and rear for extra protection when they are walking or sitting on top of wet surfaces of snow or ice. Their long and bushy raccoon-like tail is resistant to sinking in snow, and can be curled around their face and shoulders for warmth and protection from wind and blowing snow. It can even be curled around their backside like an insulated seat cushion when sitting down on a frozen surface. Large paws, and especially the extra-large paws of polydactyl Maine Coons, facilitate walking on snow and are often compared to snowshoes. Long tufts of fur growing between their toes help keep the toes warm and further aid walking on snow by giving the paws additional structure without significant extra weight. Heavily furred ears with extra-long tufts of fur growing from inside can keep warm more easily.
Personality

Maine Coons are known as the "gentle giants" and possess above-average intelligence, making them relatively easy to train. They are known for being loyal to their family and cautious—but not mean—around strangers, but are independent and not clingy. The Maine Coon is generally not known for being a "lap cat," but their gentle disposition makes the breed relaxed around dogs, other cats, and children. Many Maine Coons have a fascination with water and some speculate that this personality trait comes from their ancestors, who were aboard ships for much of their lives. Maine Coons are also well known for being very vocal cats. They are known for their frequent yowling or howling, trilling, chirping, and making other loud vocalizations.

Size

The Maine Coon was considered the largest breed of domestic cat until the introduction of the Savannah cat in the mid 1980s, and is still the largest non-hybrid breed. On average, males weigh from 13 to 18 lb (5.9 to 8.2 kg), with females weighing from 8 to 12 lb (3.6 to 5.4 kg). The height of adults can vary between 10 and 16 in (25 and 41 cm) and they can reach a length of up to 38 in (97 cm), including the tail, which can reach a length of 14 in (36 cm) and is long, tapering, and heavily furred, almost resembling a raccoon's tail. The body is solid and muscular, which is necessary for supporting their weight, and the chest is broad. Maine Coons possess a rectangular body shape and are slow to physically mature; their full size is normally not reached until they are three to five years old, while other cats take about one year.
In 2010, the Guinness World Records accepted a male purebred Maine Coon named "Stewie" as the "Longest Cat", measuring 48.5 in (123 cm) from the tip of his nose to the tip of his tail. Stewie died; February 4th, 2013, from cancer at his home in Reno, Nevada, at age 8. As of 2015 the living record-holder for "Longest Cat" is "Ludo", measuring 3 ft 10.59 in (118.33 cm). He lives in Wakefield, England, in the United Kingdom. In May 2018 the Maine Coon "Barivel" measured 120 cm (3 ft 11.2 in), making him the current holder of the Guinness World Records. This was verified on 22 May 2018 by Guinness Book Of World Records. Large Maine Coons can overlap in length with Eurasian lynxes, although with a much lighter build and lower height.
Diet

Maine Coon cats generally can eat the same food as other types of cats, although their high energy expenditure can mean that they need a larger-than-average diet. A raw diet is always better for these cats.

Health

Pet insurance data obtained from a study during years 2003–2006 in Sweden puts the median lifespan of the Maine Coon at > 12.5 years. 74% lived to 10 years or more and 54% lived to 12.5 years or more. Maine Coons are generally a healthy and hardy breed that is adapted to survive the challenging climate of New England. The most severe threat is feline hypertrophic cardiomyopathy (HCM), the most common heart disease seen in cats, whether purebred or not. In Maine Coons, it is thought to be inherited as an autosomal dominant trait. Middle-aged to older cats and males are thought to be predisposed to the disease. HCM is a progressive disease and can result in heart failure, paralysis of the hind legs due to clot embolization originating in the heart, and sudden death.
A specific mutation that causes HCM, for which testing services are offered, is seen in Maine Coons. Of all the Maine Coons tested for the MyBPC mutation at the Veterinary Cardiac Genetics Lab at the College of Veterinary Medicine at Washington State University, approximately one-third tested positive. Not all cats that test positive will have clinical signs of the disease, and some Maine Coon cats with clinical evidence of hypertrophic cardiomyopathy test negative for this mutation, strongly suggesting that a second mutation exists in the breed. The HCM prevalence was found to be 10.1% (95% CI 5.8 -14.3% ) in this study. Early growth and nutrition, larger body size, and obesity may be environmental modifiers of genetic predisposition to HCM.
Another potential health problem is spinal muscular atrophy (SMA), another genetically inherited disease that causes the loss of the spinal-cord neurons which activate the skeletal muscles of the trunk and limbs. Symptoms are normally seen within 3–4 months of age and result in muscle atrophy, muscle weakness, and a shortened lifespan. A test is offered to detect the genes responsible for SMA.
Maine Coons also seem to be predisposed to develop entropion, mainly on the lateral aspect of the eyelids, which can lead to corneal irritation and ulceration, and may require surgery.
Hip dysplasia is an abnormality of the hip joint which can cause crippling lameness and arthritis. The cats most commonly affected with hip dysplasia tend to be males of the larger, big-boned breeds such as Persians and Maine Coons. The relatively smaller size and weight of cats frequently results in symptoms that are less pronounced. 
Polycystic kidney disease (PKD) is an inherited condition in cats that causes multiple cysts (pockets of fluid) to form in the kidneys. These cysts are present from birth. Initially, they are very small, but they grow larger over time and may eventually disrupt kidney function, resulting in kidney failure. While renal cysts are observed with a low incidence in Maine Coons, PKD appears to be a misnomer in this particular breed. In a recent study spanning 8 years, renal cysts were documented by ultrasound in 7 of 187 healthy Maine Coons enrolled in a pre-breeding screening program. The cysts were mostly single and unilateral (6/7, 85.7%) small (mean 3.6 mm in diameter) and located at the corticomedullary junction (4/6, 66.7%), thus different in size, number, and location from those observed in Persian-related breeds. In the same study, not only did all six Maine Coon cats with renal cysts test negative for the PKD1 mutation, proving the disease in these cats to be unrelated to the PKD observed in Persians and related breeds, but gene sequencing of these cats failed to demonstrate any common genetic sequences. 'Maine Coon PKD' thus appears to represent a form of juvenile nephropathy other than AD-PKD.
A polydactyl Maine Coon

Many of the original Maine Coon cats that inhabited the New England area possessed a trait known as polydactylism (having one or more extra toes on a paw). Polydactylism is rarely, if ever, seen in Maine Coons in the show ring, since it is not allowed by competition standards. The gene for polydactylism is a simple autosomal dominant gene, which has been shown to pose no threat to the cat's health. Polydactyly in Maine Coon cats is characterized by broad phenotypic diversity. Polydactyly not only affects digit number and conformation, but also carpus and tarsus conformation. The trait was almost eradicated from the breed due to the fact that it was an automatic disqualifier in show rings. Private organizations and breeders were created in order to preserve polydactylism in Maine Coon cats.