So... is Super Shiro finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Super Shiro is a spin-off focusing on the lovable family dog, Shiro, from the popular series Crayon Shin-chan.
While maintaining the familiar charm of the original, this series gives Shiro his own spotlight.
Expect to see Shiro embark on his own adventures, separate from the Nohara family's daily antics.
It's safe to assume that Shiro will be doing things you wouldn't normally expect a family dog to do, likely involving secret missions or extraordinary abilities, all while celebrating TV Asahi's 60th anniversary.