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Many dogs of this breed will have "low" thyroid values, but no clinical symptoms. Vets and owners differ on the relative merits of medicating dogs which test "low", but are completely asymptomatic. Some researchers think that asymptomatic hypothyroidism may have been adaptive in the regions of origin for many breeds, since less nutrition is required for the dog to stay in good condition.
Therefore, attempts to eliminate "low thyroid" dogs from the Tibetan Mastiff gene pool may have unintended consequences for the breed. The Tibetan mastiff is a phenotypically distinct dog breed that was bred as a flock guardian in the high altitudes of the Himalayas and the Tibetan Plateau.
The dogs of Thibet are twice the size of those seen in India, with large heads and hairy bodies. They are powerful animals, and are said to be able to kill a tiger. During the day they are kept chained up, and are let loose at night to guard their masters' house. In the early 20th century, King George V introduced a pair of Tibetan Mastiffs, and enough of the breed were available in England in to be shown at the Crystal Palace show.
However, during the war years, the breed lost favor and focus and nearly died out in England.
After , the breed began to gain in popularity worldwide. Although the breed is still considered somewhat uncommon, as more active breeders arose and produced adequate numbers of dogs, various registries and show organizations FCI, AKC began to recognize the breed. Since AKC recognition, the number of active breeders has skyrocketed, leading to over-production of puppies, many of which are highly inbred and of questionable quality. Initially, the breed suffered because of the limited gene pool from the original stock, but today's reputable breeders work hard at reducing the genetic problems through selective breeding and the international exchange of new bloodlines.
However, some few breeders cling to the practice of inbreeding, do not perform health tests on their breeding stock, and do not support buyers of the puppies they produce. Many puppies and adult dogs end up in shelters and in rescue situations. A Chinese woman was reported  to have spent more than 4 million yuan to buy an month-old purebred male Tibetan Mastiff, which she named Yangtze No.
The Tibetan Mastiff was able to adapt to the extreme highland conditions of the Tibetan Plateau very quickly compared to other mammals such as the yak, Tibetan antelope, snow leopard, and the wild boar. The Tibetan Mastiff's ability to avoid hypoxia in high altitudes, due to its higher hemoglobin levels compared to low-altitude dogs, was due to prehistoric interbreeding with the Tibetan wolf. From Wikipedia, the free encyclopedia. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources.
Unsourced material may be challenged and removed. Vintage Dog Books. November 18, GoldStein; T. Shelling; J. Surkhang eds. The new Tibetan-English dictionary of modern Tibetan. Tibet Travel and Tours - Tibet Vista.
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Retrieved American Kennel Club. Retrieved 9 March The Tibetan Mastiff: canine sentinels of the range. Not only was the Tibetan Spaniel prized as a pet and companion, but it was also a useful member of Tibetan monastic life. The little dogs would sit on the monastery walls, keeping watch over the countryside.
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Their keen eyesight and ability to see great distances made them excellent watchdogs. They also slept with the monks at night to provide warmth.
Village-bred Tibetan Spaniels varied greatly in size and type, and the smaller puppies were usually given as gifts to the monasteries. In turn, these smaller dogs used in the monastery breeding programs were probably combined with the more elegant Tibetan Spaniel-type dogs brought from China.
Those bred closer to the Chinese borders were characterized by shorter muzzles. An open secondary registry was maintained. Professor Ludvic von Schulmuth studied the origins of skeletal remains of dogs in human settlements as old as ten thousand years. The Professor created a genealogical tree of Tibetan dogs. The Tibetan Spaniel is a generally healthy dog with a life expectancy of 13—16 years.
The disease is painless and affected dogs become completely blind. Currently there is no treatment, but affected dogs generally adapt well to their progressive blindness. The earliest clinical sign of progressive retinal atrophy is "night blindness. The dog will show a reluctance to move from a lighted area into darker surroundings. The night blindness develops progressively into complete blindness. The mutation was identified by Louise Downs, as part of her PhD studies.
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This rare condition in Tibetan Spaniels is often referred to as a "liver shunt". Most shunts cause recognizable symptoms by the time a dog is a young adult but are occasionally diagnosed only later in life. Since the severity of the condition can vary widely depending on how much blood flow is diverted past the liver it is possible for a lot of variation in clinical signs and time of onset. Often, this condition is recognized after a puppy fails to grow, allowing early diagnosis.
Signs of portosystemic shunts include poor weight gain, sensitivity to sedatives especially diazepam , depression, pushing the head against a solid object, seizures, weakness, salivation, vomiting, poor appetite, increased drinking and urinating, balance problems and frequent urinary tract disease or early onset of bladder stones. A dramatic increase of these signs after eating is a strong supportive sign of a portosystemic shunt. American English Coonhound.
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