T-Locus (tailless)

The T-Locus is a region of your dog's DNA which determines whether they have a genetic bobtail (tailless) or not.

The bobtail is caused by a mutation in the T gene. Bobtail is autosomal dominant meaning that a dog only needs to inherit one copy of the mutation to have a genetic bobtail. Dogs which inherit two copies of the bobtail mutation will die in utero and therefore not survive to birth.