Thai Ridgeback
The Thai Ridgeback is an ancient breed of dog. The breed was formerly unknown outside of Thailand, but is gaining notice in the western world. The breed is still very rare outside of Thailand . The Thai Ridgeback is one of only three breeds that has a ridge of hair that runs along its back in the opposite direction to the rest of the coat (The others are Rhodesian Ridgeback and Phu Quoc Ridgeback). They are also known as a Mah Thai Lang Ahn.Description
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Appearance and Structure
The Thai Ridgeback is a muscular, medium-sized pariah-type dog with a wedge-shaped head, triangular-shaped prick ears, and a very short, smooth coat. It has a
pronounced ridge on its back formed by hair growing in the opposite direction that extends from behind the withers to the hips. Puppies are occasionally born ridgeless. Thai Ridgebacks have muscular thighs and a streamlined body, making them extremely agile. The sickle tail is carried upward. Its forehead wrinkles with enormous expression. The tongue can be black or have black marks. Eyes are brown or amber and almond-shaped. The ears are set low and point slightly outward. The ears stand up progressively during the puppy growth period, they are not cropped. The back is straight and level. The coat is short, hard, and straight. Due to the length and density 
of the coat shedding is minimal, occuring once or twice yearly. Because this breed does not have an undercoat the hair does not usually bother people allergic to other breeds of dogs. Coat must be solid colors of blue, black, red or fawn for the show ring with a black mask being acceptable on reds and fawns. However, brindle and white are also found. For international show and competition, shoulder height should be 22-24 inches (56-61 cm) in males and 20-22 inches (51-56 cm) in females. The weight averages 35-55lbs in females and 50-75lbs in males.Eight distinctive ridge patterns have been identified: needle, feather, arrow, lute, violin, bowling pin, leaf, and saddleback. All patterns are acceptable, but must be clearly defined and symmetrical. The broader the ridge, the more highly it is prized.
Temperament
Thai Ridgebacks are an intelligent breed. The energy level is typically low to medium, with most of the day spent lounging and activity periods occurring in sporadic bursts. Well bred and
properly socialized Thai Ridgebacks make loyal, loving family pets. They are naturally protective of their home and family and can be aggressive or shy when not properly socialized. They are best kept by dominant owners who have a thorough understanding of dog behavior. Because of prior geographic isolation and lack of human contact, the Thai Ridgeback remains independent minded and much of the original natural instinct and drives remain intact, particularly prey drive. Due to its nature, the Thai Ridgeback is not recommended for the novice dog handler unless you seek training guidance from a professional with an understanding of primitive breeds. They have an excellent jumping ability and may seek to roam if not properly contained.
GeneticsNeedle Ridge
Violin ridge
The ridgeback is under a control of two groups of epistatic genes. The first determines the existence of the ridge. The other determines the size of the ridge, from none to v
ery large (down to the side). For the latter, the more the genes in the dog, the broader is the ridge. The ridge will appear only if there is at least one dominant allele in both groups.Coat color is also under a control of two groups of epistatic genes. The first determines the color of the coat if it should be black, brindle, red or white. The series of dominance is black to brindle to red to white. The intensity of the coat color is under control; of a set of modifying genes. The other group control the dilution of the colors. Black can be dilute to gray/silver/blue, and red will turn fawn. The normal color is dominance over the diluted.
Health
Thai ridgebacks are a hardy, overall healthy breed with few inherent heath issues. The breed has reproduced in Thailand almost exclusively by natural selection until the very recent past. The domesticated population is small. Inbreeding depression has not been observed in the breed. Thai Ridgeback Dogs are prone to dermoid sinus. Modern lines of Thai Ridgeback, resulting from interpopulation crosses, may also be prone to hip dysplasia and other genetic disorders.History
The origin of the Thai Ridgeback is undocumented, but the breed was
developed in eastern Thailand. The history of the breed is the subject of numerous hypotheses. It is generally considered a Pariah-type dating back to ancient times. The Thai Ridgeback may have mutated from another form of Thai dog which has similar appearance but with no ridge on the back. Rock art indicated that Thai dogs had accompanied a hunter since the new stone age of the country (over 2,000 years ago). Due to the isolation of Thai villages in the past, the breed had been inbred within the village for centuries. As a result, the appearance of the breed is quite uniform. Most lethal traits had been discarded through several generations of natural selection. The breed has a low level of inbreeding depression. The relationship between the Thai Ridgeback and the Rhodesian 
Ridgeback is uncertain, but possible through the Hottentot Dog or Ari Dog. There is no scientific proof that they are related.The third existing breed of ridgeback dogs is the Phu Quoc Dog of Vietnam, which is somewhat smaller than the Thai Ridgeback. Based on genetic-based hypothesis, both Thai Ridgeback Dog and Phu Quoc Dog are likely to be descended from Funan Ridgeback Dog which originated over 1,000 years ago in Funan Era of the region. The Hottentot Dog or Ari Dog (as called by the tribe), a known African ridgeback ancestor of the Rhodesian Ridgeback, is now extinct. Its link to the Funan Ridgeback Dog is very likely in a historian opinion. The possible genetic connection among the three remaining breeds is being investigated through DNA studies.
Article:http://en.wikipedia.org/
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