TOY POODLE
Approximately 10" or under at the highest point of the shoulders.
MINIATURE POODLE
Approximately 10-15" at the highest point of the shoulder. Miniatures and Toys were bred down from the Standard Poodle.
MOYEN (KLEIN) POODLE
Approximately 15-21" at the highest point of the shoulder. Moyen or Klein Poodles are recognized in Europe but in the US, they are considered a Standard Poodle.
STANDARD POODLE
Any poodle over 15" at the highest point of the shoulder.
ROYAL POODLE
Any poodle over 26" tall.
The oldest of the three breeds of Poodle is the Standard Poodle, from which the Toy, Miniature, Moyen/Klein and Royal were developed. All 5 sizes of Poodles are recognized in other countries but the AKC in the US places all poodles in only 3 groups: Toy - Miniature - Standard.