Shiro

A white, fluffy puppy Shin-chan found in a cardboard box early in the series. 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, he has developed a talent for foraging. An oddly human like dog, he is very responsible and painstakingly careful.

(Source: Wikipedia)