Short tail

The presence of short tail variant of the T-box gene is related to a reduced tail size.


The short tail trait results in a phenotype with a small or practically non-existent tail size. The variant responsible for the trait is found in the T-box gene, a gene essential in the proper development of various tissues and organs of the dog, such as the limbs.

Genetic basis

The variant responsible for the short tail phenotype has a dominant inheritance, therefore, a single copy of the c.189C>G variant is sufficient to express this phenotype. In this case, there is a 50% probability that the mutation can be inherited by the offspring of the carrier dog. However, the presence of two copies of the c.189C>G variant is not compatible with life because this situation causes fetal death of the puppy. For this reason, mating two dogs carrying the c.189C>G variant is not recommended because of the possible reduction in litter size. It is possible that there are other as yet unknown genetic factors involved in the development of the trait.

Other relevant information

Despite being a mutation, the short tail trait can have health benefits for the dog. Dogs with short tails reduce the risk of injury during physical activities such as jumping, climbing or running. In addition, it is easier to maintain proper hygiene of a short tail than a long one, thus avoiding possible skin infections. The trait is also called "bobtail" and is commonly found in the Pembroke Welsh Corgi, Miniature American Shepherd, Old English Sheepdog, Australian Cattle Dog and Boston Terrier breeds.


Do you still not know the true nature of your dog?

Unlock the secrets of your pet's DNA with our two ranges.


Breeds + Physical traits


Health + Breeds + Physical traits

DNA Day Promotion

Only until April 25

-15% on our dog DNA tests

Use our code DNA15