Although the animals entered in all four sections of the Stud Book vary in size and substance, all show evidence of their common ancestor, the Welsh Mountain Pony.

The best inherit the strong constitution, good bone, courage, activity and equable temperament that has led to worldwide renown.

It is therefore not surprising that they are in such demand for crossing with other breeds, and there is a Welsh Part-Bred Register for horses, cobs and ponies whose breeding shows not less than 12.5% of Registered Welsh blood.