Shiro (シロShiro), Lucky in the Vitello and Phuuz dubs and Whitey in the Funimation and LUK Internacional dubs, is a white (Shiro means white), fluffy pup Shin-chan found in a cardboard box in episode 7 (I found a Puppy). While a beloved member of the family, he is the subject of neglect thanks to his owner's forgetfulness and short attention-span. He is a very intelligent dog, often presenting logic and intellect that surpasses his human owners. As his meals from the Noharas are at best inconsistent, and at worst far-between, he has developed a venerable talent for foraging and scavenging to survive days without meals. An oddly human like dog, he is very responsible and painstakingly careful.
He is very beloved to Shin-Chan, but Shin-Chan often teases, mocks, and forgets about him. His doghouse also often ends up becoming a place for Shin-chan to hide himself or something he doesn't want his family to find. He often plays protector to Himawari, more often than not sacrificing his well being in the process. In the special episode 53 it is discovered that Shiro and Shin-chan are born in the same year, which means that they are both 5 years.
He looks a lot like a cotton candy. (Quoth Shinchan, upon leaving Shiro in a stranger's care for a few moments, "He looks like cotton candy, but don't eat him.") Shin chan gotten some laughs out of the poor puppy by putting cold masks on him, though, and has taught Shiro two tricks: kai-kai chinchin, wherein Shiro scratches himself, and wata-ame seijin ('cotton-candy alien'), when Shiro curls up like a big ball of cotton candy and rolls around.
His original owner is Run.