Pembroke Welsh Corgis may be born with a long tail or with a shorter natural bob tail. If born with a long tail, PWCs commonly have their tail docked. Countries where tail docking is illegal will select dogs with the genetic markers for a short tail when breeding.
Folklore says the Corgi was discovered when fairies left a pair of Corgi puppies for humans to find. Fairies were said to have ridden Corgis, and the saddle-like markings on their back are proof, as the story goes.
The Pembroke Welsh Corgi and Cardigan Welsh Corgi are considered two separate breeds, though differences may be difficult to spot. The Cardigan Welsh Corgi—cousin to the Pembroke Welsh Corgi—has a long tail, more rounded ears, and is slightly larger. The Pembroke is smaller and more affectionate than the Cardigan.
No, a Pembroke Welsh Corgi is not hypoallergenic. The PWC is a double-coated dog who sheds considerably.
Corgis have a type of dwarfism called chondrodysplasia which causes their limbs to harden at the tips and stop growing early. The short-legged silhouette was perfect for herding cattle, so breeding for the characteristic passed on the trait to the modern-day Corgi.