Jesse James is in the middle of an all out doghunt in Long Beach, California right now -- after his adorable four-legged friend Cinnabun suddenly went missing.



James -- who's married to Sandra Bullock -- posted an alert on his Twitter page, begging anyone who may come across the "Fawn Pit Bull" to return her to Jesse's West Coast Choppers bike shop.

We're told the dog was last seen wearing a pink collar ... so keep your eyes peeled Long Beach!