The story
Blend of Shih Tzu + -poo (“poodle”). The term is traditionally formatted in the lowercase, but variants like Shih-Poo may occur, likely modeled after the capitalization within Shih Tzu.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A dog that is a cross between a Shih Tzu and miniature poodle. Full definition →