Mini corgis are regular Pembroke Welsh corgis that have been selected to be slightly smaller than the normal size. The breed standard for Pembroke Welsh corgis requires the breed to be around 25 to 27 pounds. Mini corgis weigh 16 to 22 pounds.
The American Kennel Club (AKC) breed standard states that "diminutive toy-like individuals must be severely penalized", suggesting that mini corgis may not meet the breed standard. Pembroke Welsh corgis used to be smaller than they are now, which is why it is easy to find small corgis weighing 20 pounds or less to use in breeding for smaller dogs.