The Welsh section D, also known as the Welsh cob, is the largest of the Welsh breeds with no upper height limit but must exceed 13.2hh. The breed should retain pony character and true Welsh type, with any color allowed except piebald and skewbald. The Welsh Pony and Cob Society provides conformation standards for both the Welsh C and D, emphasizing strength, hardiness, and agility.

Welsh section Ds are versatile and can be found in various disciplines such as showing, dressage, working hunter classes, eventing, show jumping, and hunting. They are known for their movement and athleticism, with some also excelling in driving. The breed is generally hardy and can carry most adults and taller riders, making them popular in the equestrian world.

When looking for a Welsh section D, it is important to consider the type, character traits, and natural talent of the pony. Prices for Welsh cobs can vary depending on factors such as quality, competition record, and breeding. It is recommended to organize a pre-purchase vetting before buying a pony to ensure its suitability for the intended use, whether it be for showing, competition, or other purposes.