The Pembroke is the more popular breed of dog, with the Cardigan Welsh Corgi appearing on The Kennel Club's list of Vulnerable Native Breeds. There are several physical differences between the two types according to the breed standards, with the Cardigan being a larger overall dog, both in weight and in height. Traditionally, the tails were of different shapes, but docking had been previously used. With regards to their health, according to a 2004 survey, they both had similar life spans although kidney or urethral conditions are more likely in the Pembrokes. Furthermore, Pembroke Corgis were more likely to have eye problems than the Cardigan breed. Welsh Corgis have strong ties to Queen Elizabeth II, who has personally owned more than 30 dogs, either Pembrokes or Corgi/Dachshund crosses.