Pembroke Welsh Corgis differ from the Cardigan Welsh Corgi by being shorter in length, having smaller ears, and being slightly straighter of leg. The Pembroke Welsh Corgi has a 'fairy saddle', somewhat lighter markings on each side of the withers caused by changes in the thickness, length, and direction of hair growth. The Pembroke Welsh Corgi sheds mostly in the spring and autumn and may shed annually, with intact females shedding during heat.Breed faults exist; some which may acknowledge genetic health conditions such as 'fluffies' which are corgis with very long coats, and 'bluies,' which have a dilute colour (red coats present with a bluish cast).While some outlying Pembroke Welsh Corgis are born with their tail naturally short or missing, the majority often have their tails docked between 2–5 days old due to historical tradition or to conform to the Breed Standard. Artificial docking was needed for the dog to do its job as a herding dog in the United Kingdom.