why do some dogs have short tails

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More than one gene is responsible for tail suppression in cats; research is incomplete, but it is known that the Japanese Bobtail and related breeds have a different mutation from that found in the Manx and its derivatives. в tails are short an kinked, but not entirely absent
в tails are short an kinked, but not entirely absent в tails are short an kinked, but not entirely absent, and, a variant of the A mutation in a gene called the T-box transcription factor T gene (C189G) accounts for natural bobtails in 18 of 24 dog breeds studied, but not in another 6 dog breeds, for which the genetic mechanism is yet to be determined.

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Breeds in this sub-list often have full tails. The Pembroke Welsh corgi, as a team of British researchers discovered in 2001, has a short or nonexistent tail because of a genetic anomaly called the T-box mutation. In a European study published in the October 2008 Journal of Heredity, 23 breeds in which short tails occur naturally were tested.

The same genetic mutation was found in 17, most of them herding and hunting breeds. Some are rare in North America. Those recognized by the American Kennel Club include the Australian shepherd, Pyrenean shepherd, Polish lowland sheepdog, Australian cattle dog, Spanish water dog, Brittany, Jack Russell terrier, schipperke and Swedish vallhund.

Of six mutation-free breeds, Boston terriers and English bulldogs consistently all either lack or have very short and kinky tails, the researchers wrote. Although they didn t understand why, they believed another gene must be responsible. Four breeds in which natural bobtails occasionally occur even when both parents have long tails include the Parson Russell terrier, King Charles spaniel, miniature schnauzer and Rottweiler.

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