What size is a full grown Shih Poo?

Most full-grown Shih Poos weigh between 10 and 20 pounds and stand eight to 18 inches tall. At first glance, a Shih Poo looks like a small dog, but looks can be deceiving. The breed has short legs, but these dogs can weigh up to 28 pounds. Shih Poos with a Miniature Poodle parent are larger than those with a Toy Poodle parent.