A Report from the Animal Health Trust
Gene for Short-Tail (Bob-Tail) in Dogs
Note in Sweden they are referred to as stubb tails not bob tails.
A gene causing short-tails (or "bob-tails") has been identified and published in the scientific literature in 2001. Subsequent research (reported in 2009) has extended the number of breeds having this short-tail form of the gene, although not all breeds with short-tails show this genetic change (mutation).
Research was carried out on the Swedish Vallhund starting late 2010.
The mutation causing the trait is in a gene called a T-box transcription factor involved in development of the embryo.
The test applies to Pembroke Welsh Corgis and to Australian Shepherds as well as several other breeds e.g.(Swedish Vallhund). In the breeds covered, the test can be used to confirm that an individual dog has a naturally short-tail, rather than a docked-tail.
Results will be sent as:
CLEAR: the dog has two copies of the normal form of the gene and no copies of the short-tail form of the gene and will show a longer tail
ONE COPY: the dog has one copy of the normal form of the gene and one copy of the short-tail form of the gene and will show a short (bob)-tail.
So far, no dogs with two copies of the short-tail form of the gene have been reported, and it is believed that the embryos do not survive and that no pups with this genetic status are born.
Therefore, all dogs with one copy of the short-tail gene and one copy of the normal form of the gene will have a short-tail, dogs with two copies of the normal form of the gene will have a long-tail, unless other factors are involved.
Haworth,K., Putt,W., Cattanach,B., Breen,M., Binns,M., Lingaas,F., Edwards,Y.H. (2001) Canine homolog of the T-box transcription factor T; failure of the protein to bind to its DNA target leads to a short-tail phenotype. Mammalian Genome 12 212-218.
Hytönen,M.K., Grall,A., Hédan,B., Dréano, Seguin,S.J., Delattre,D., Thomas,A., Galibert,F., Paulin,L., Lohi,H., Sainio,K. and André.C. (2009) Ancestral T-Box Mutation is present in many, but Not All, Short-Tailed Dog
The MODE OF INHERITANCE OF THE LETHAL GENE IS NOT DOMINANT OR RESSESSIVE A MULTITUDE OF GENES IS INVOLVED. Further research would be necessary.
If any owner worldwide would like a certificate of tail status the information is below :-
Samples submitted should be mouth swabs (a non-invasive sampling method) obtainable from the Animal Health Trust. Samples should be sent together with a completed DNA Testing form and payment for each sample to Genetic Services, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk CB8 7UU.
Kits for taking cheek swabs are available by phoning 01638 555621 or via e-mail to firstname.lastname@example.org. The price of the test is £72, which includes both VAT and the cost of the sampling kit. Further information can be obtained by e-mailing email@example.com