Natural Bobtail (T Locus)

General Information: The T Locus, associated with the T gene, is responsible for the natural bobtail trait in dogs, which results in a naturally shortened tail or, in some cases, a complete absence of a tail. This trait is visible from birth and is characterized by a tail length that is significantly shorter than that of dogs with a standard, full-length tail. The natural bobtail is a common feature in several dog breeds, including the Australian Shepherd and Pembroke Welsh Corgi, and is considered a desirable trait in certain breeding programs due to its distinctive appearance. While natural bobtails generally do not cause health issues, it is important to distinguish between naturally bobtailed dogs and those with docked tails, which are surgically shortened. Understanding the genetic basis of the T Locus can help breeders select for this trait, ensuring the consistent appearance of naturally bobtailed offspring.

Gene / Testing Information: Genetic testing for the T gene is essential for identifying dogs that carry the natural bobtail trait, which is inherited in an autosomal dominant manner. This means that a dog only needs one copy of the T gene mutation from one parent to exhibit a natural bobtail. However, dogs with two copies of the mutation often have more severe skeletal abnormalities and may be non-viable. Therefore, breeding decisions should be made carefully to avoid mating two dogs that both carry the T gene mutation. Each puppy from a pairing where one parent carries the T gene mutation has a 50% chance of being born with a natural bobtail and a 50% chance of having a standard tail. Reliable genetic testing is crucial for breeders who want to predict and select for this trait, as it helps ensure the health and viability of the offspring. By carefully managing breeding pairs, breeders can maintain the natural bobtail trait while minimizing the risk of producing puppies with severe skeletal issues, supporting healthier and more consistent breeding outcomes.