The Pembroke Welsh Corgi (Welsh for "dwarf dog") is a cattle herding dog breed that originated in Pembrokeshire, Wales. It is one of two breeds known as a Welsh Corgi. The corgi is one of the smallest herding dogs. Pembroke Welsh Corgis are famous as the preferred breed of Queen Elizabeth II, who has owned more than 30 during her reign.
The Pembroke Welsh Corgi has erect ears that are in proportion to the equilateral triangle of the head. The head should be "fox-like" in shape and appearance. 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.
Pembroke Welsh Corgis are very affectionate, love to be involved in the family, and tend to follow wherever their owners go. They have a great desire to please their owners, thus making them eager to learn and train. The dogs are easy to train and are ranked as the eleventh most intelligent dog in Stanley Coren's The Intelligence of Dogs. Besides herding, they also function as watchdogs due to their alertness and tendency to bark only as needed. Most Pembrokes will seek the attention of everyone they meet and behave well around children and other pets. It is important to socialize this breed with other animals, adults, and children when they are very young to avoid any anti-social behaviour or aggression later in life. Due to their herding instinct, they love to chase anything that moves, so it is best to keep them inside fenced areas. The herding instinct will also cause some younger Pembrokes to nip at their owners' ankles.
Source: Wikipedia.org