The most obvious difference between the three types of poodles is size: Standard Poodles: 22-27 inches at the shoulder Miniature Poodles: 13-15 inches at the shoulder Toy Poodles: 10 inches or less at the shoulder That said, there are personality differences as well—Miniature Poodles and Toy Poodles tend to be lower energy and more anxious than Standard Poodles. Miniature Poodles and Toy Poodles are also predisposed to patellar luxation, a congenital problem with the kneecaps.  Featured Image: iStock/ivanastar