The Siamese cat (, Maeo Thai; , Maeo Sayam; , Maeo Wichien Maat) is one of the first distinctly recognised breeds of domestic cat. It is selectively bred since the end of the 19th-century from the Wichianmat landrace, one of several varieties of cats native to Thailand (known as Siam before 1939), and is pedigreed in all major cat fancier and breeder organisations. Siamese cats have a distinctive colourpoint coat, resulting from a temperature-sensitive type of albinism. Distinct features like blue almond-shaped eyes, a triangular wedged head shape, large wide-set ears, an elongated, slender, and muscular body, and various colours of point colouration characterise the breed.
The breed was one of the most popular cat breeds in Europe and North America in the 19th century. Around the 1950s, the modern-style body with slender and angular features became the preferred type by Siamese enthusiasts. From the 1980s onwards, the traditional "old-style" (rounder-built) cats started to officially split off from the (modern-style) Siamese breed and were re-established by multiple registries as the separate Thai cat breed. The terms "Siamese" or "Thai" are used for cats from these specific breeds, which are by definition all purebred cats with a known and formally registered ancestry, also known as the cat's pedigree or "paperwork".
The Siamese is used as foundation stock in several new cat breeds; by crossbreeding them with other cats. The Oriental and Colourpoint Shorthair were developed to expand the range of Siamese coat patterns. Crossbreeding with Persians resulted in a long-haired colourpoint variant called the Himalayan. The long-haired Siamese is recognised internationally as the Balinese. Crossbreeding also introduced Siamese features in several hair-mutation breeds, including the Cornish Rex, Sphynx, and Peterbald.
A description and depiction of the Wichianmat (colourpointed landrace cat in Siam) first appears in a collection of ancient manuscripts called the Tamra Maew (The Cat-Book Poems), thought to originate from the Ayutthaya Kingdom (1351 to 1767 AD). Over a dozen are now kept in the National Library of Thailand. The manuscripts have resurfaced outside of Thailand and are now in the British Library and National Library of Australia.
At the end of the BurmeseâÂÂSiamese war, the capitol was sacked on 7 April 1767. The Burmese army burned everything in sight and returned to Burma, taking Siamese noblemen and royal family members with them as captives. A Thai legend states that the King of Burma Hsinbyushin found and read the poem of the Wichianmat cats in the Tamra Maew. The poem describes Wichianmat cats as being as rare as gold, and anyone who owns this cat will become wealthy. He told his army to round up all the cats and bring them back to Myanmar (Burma) along with the other treasures.
The pointed cat known as the "Siamese", recognised for its distinctive markings, is selectively bred in the West from the Wichianmat, one of several landraces of cats from Siam described and illustrated in the Tamra Maew manuscripts, estimated to have been written from the 14th to the 18th century. In 1878, US President Rutherford B. Hayes received the first documented Siamese to reach the United States. The cat, named "Siam," was sent from Bangkok to the US Consul. In 1884, the British Consul-General in Bangkok, Edward Blencowe Gould (1847âÂÂ1916), brought a breeding pair of the cats, Pho and Mia (à ¸Âà ¹Âà ¸Âà ¹Âà ¸¥à ¸°à ¹Âà ¸¡à ¹Â), back to Britain as a gift for his sister, Lilian Jane Gould (who, married in 1895 as Lilian Jane Veley, went on to co-found the Siamese Cat Club in 1901). In 1885, Gould's UK cats Pho and Mia produced three Siamese kittensâÂÂDuen Ngai (à ¹Âà ¸Âà ¸·à ¸Âà ¸Âà ¸«à ¸Âà ¸²à ¸¢), Kalohom (à ¸Âà ¸¥à ¸²à ¹Âà ¸«à ¸¡), and Khromata (à ¸Âà ¸£à ¸¡à ¸Âà ¹Âà ¸²)âÂÂwho were shown with their parents that same year at London's Crystal Palace Show. Their appearance and behaviour attracted attention, but all three of the kittens died soon after the show, their cause of death not documented.
By 1886, four Siamese cats were imported to the UK by Eva Forestier Walker (surnamed Vyvyan after 1887 marriage) and her sister, Ada. These Siamese imports were long, had rounded heads with wedge-shaped muzzles, and large ears. The cats ranged from substantial to slender but were not either extreme. The difference in the pointed coat pattern had not been seen before in cats by Westerners.
Over the next several years, fanciers imported a small number of cats, forming the foundation stock for the entire breed in Britain. Due to digitalisation of the extensively kept ancestry paperwork by the cat registries, it is possible to trace the pedigree of most Siamese cats of today back to (one or more of) these original imports. In Britain, these original imports were called the "Royal Cat of Siam." Some reports say that they had previously been kept only by Siamese royalty. However, research does not show evidence of any organised royal breeding programme in Siam.
In the 1950sâÂÂ60s, as the Siamese was increasing in popularity, many breeders and cat show judges began to favour the more slender look. Breeders created increasingly long, fine-boned, narrow-headed cats through generations of selective breeding. Eventually, the modern show Siamese was bred to be extremely elongated, with a lean, tubular body, long, slender legs, a very long, very thin tail that tapers gradually into a point, and a long, wedge-shaped head topped by extremely large, wide-set ears.
By the mid-1980s, cats of the traditional style had largely disappeared from cat shows. Still, a few breeders, particularly in the UK, continued to breed and register them, resulting in today's two types of standardised breed: the modern, "show-style" Siamese, and the "traditional" type, now Thai, both descended from the same distant Wichianmat landrace ancestors, but with few or no recent ancestors in common, and effectively forming distinct sub-breeds. As a result, from the 1980s onwards, multiple cat registries re-established the "traditional, old-style" breeding lines into a separate breed. In addition to the modern Siamese breed, The International Cat Association (TICA) and the World Cat Federation (WCF) now accept cats of the "old-style" type, and any Wichianmat cat imported directly from Thailand, under the new breed name Thai. Other unofficial nicknames for the Thai breed are "Old-style", "Classic", or "Traditional", with this variation (previously) derogatory nicknamed "Applehead" in the US.
In the 2024 statistics of FIFe, one of the major global cat registries, the breed ranked at position 17 out of 54 breeds in popularity, comprising 1% of their total registered kittens that year, which translates to 929 cats.
The breed standard of the modern Siamese calls for an elongated, tubular, and muscular body and a triangular head, forming a triangle from the tip of the nose to each tip of the ear. The eyes are almond-shaped and light blue, while the ears are large, wide-based, and positioned more towards the side of the head. The breed has a long neck, a slender tail, and fur that is short, glossy, fine and adheres to the body with no undercoat. Its pointed colour scheme and blue eyes distinguish it from the closely related Oriental Shorthair. The modern Siamese shares the pointed colour pattern with the Thai, but they differ in head and body type.
Many foundation stock cats from Thailand had a kink in their tails, but over the years, this trait has been considered a flaw. Breeders have largely eradicated it around the 1950s, but the kinked tail persists among street cats in Thailand.
The colourpoint pattern is a form of partial albinism (acromelanism), resulting from a mutation in tyrosinase, an enzyme involved in melanin production. The mutated tyrosinase enzyme is heat-sensitive; it fails to work at normal body temperatures but becomes active in cooler (< 33 ðC) areas of the skin. The heat-sensitive enzyme results in a dark colouration in the coolest parts of the cat's body, like the extremities and the face, which are cooled by the airflow through their sinuses.
Due to the temperature-sensitive pigmentation, Siamese cats tend to darken with age, and generally, adult Siamese living in warm climates have lighter coats than those in cool climates. Siamese kittens are cream to white at birth and develop visible points in the first few months of life in colder parts of their body. By the time a kitten is four weeks old, the points should be sufficiently distinguishable to recognise which colour they are.
Originally the vast majority of Siamese had black ('seal'; extremely dark brown, almost black) points, but occasionally Siamese were born with blue (a cool grey) points, genetically a dilution of black point; chocolate (lighter brown) points, a genetic variation of black point; or lilac (pale warm grey) points, genetically a diluted chocolate. These colours were considered "inferior" black points and were not qualified for showing or breeding. These shades were eventually accepted by the breed associations and became more common through breeding programmes specifically aimed at producing these colours. Later, outcrosses with other breeds developed Siamese-mix cats with points in other cat colours and patterns, including red and cream points, tabby (US English: 'lynx') points, and tortoiseshell ('tortie') points.
In most cat registries, all pointed Siamese-style cats are considered part of the Siamese breed. The allowed colourpoint colourations in the Siamese are:
These base colours are allowed in combination with the following patterns and effects:
Siamese are usually very affectionate and intelligent cats, renowned for their social nature. Many enjoy being with people and are sometimes described as "extroverts". Often they bond strongly with a single person. Myrna Milani describes the Siamese as being more diurnal, more likely to stay close to their owner, and less likely to hunt than other cats.
Based on Swedish insurance data, which tracked cats only up to 12.5 years, Siamese and Siamese-derived breeds have a higher mortality rate than other breeds. 68% lived to 10 years or more and 42% to 12.5 years or more. The majority of deaths were caused by neoplasms, mainly mammary tumours. The Siamese also has a higher rate of morbidity. They are at higher risk of neoplastic and gastrointestinal problems but have a lower risk of feline lower urinary tract disease. A UK study of veterinary records found a life expectancy of 11.69 years for the Siamese compared with 11.74 years overall.
The same albino allele that produces coloured points also results in abnormal neurological connections between the eye and the brain. The optic chiasm has abnormal uncrossed wiring; many early Siamese were cross-eyed to compensate, but like the kinked tails, the crossed eyes have been seen as a fault, and due to selective breeding the trait is far less common today. Unlike many other blue-eyed white cats, Siamese cats do not have reduced hearing ability.
The Siamese suffers from abnormal visual projections due to the lateral geniculate body of the eye differing from normal felines. Fibres located in the temporal retina cross over in the chiasm instead of remaining uncrossed. The breed has also been found to have a predisposition to progressive retinal atrophy.
The Siamese is predisposed to periocular leukotrichia, pinnal alopecia, and psychogenic alopecia.
Young Siamese cats are predisposed to histiocytic cutaneous mast cell tumours.
The Siamese is one of the more commonly affected breeds for gangliosidosis 1. An autosomal recessive mutation in the GBL1 gene is responsible for the condition in the breed.
Siamese cats have been protagonists in literature and film for adults and children since the 1930s. Clare Turlay Newberry's Babette features a Siamese kitten escaping from a New York apartment in 1937. British publisher Michael Joseph recorded his relationship with his Siamese cat in Charles: The Story of a Friendship (1943). The "Siamese Cat Song" sequence ("We are Siamese if you please") in Walt Disney's Lady and the Tramp (1955), features the cats "Si" and "Am", both titled after the former name of Thailand, where the breed originated. The 1958 film adaptation of Bell, Book and Candle features Kim Novak's Siamese cat "Pyewacket", a witch's familiar.
The Incredible Journey (1961) by Sheila Burnford tells the story of three pets, including the Siamese cat "Tao", as they travel through the Canadian wilderness searching for their beloved masters. The book was a modest success when first published but became widely known after 1963 when it was loosely adapted into a film of the same name by Walt Disney. Disney also employed the same Siamese in the role of "DC" for its 1965 crime caper That Darn Cat!, with The New York Times commenting "The feline that plays the informant, as the F.B.I. puts it, is superb. [...] This elegant, blue-eyed creature is a paragon of suavity and grace".