Pamela Anderson -- Ballistic Over Rick Salomon's Annulment Docs ... Dog is Now Missing

Bumblebee the dog is MIA from Pamela Anderson's Malibu compound, and her estranged husband thinks it's all out of revenge because he filed to annul their marriage.

Sources close to the couple tell TMZ ... Pamela saw our post Thursday morning that Rick Salomon has filed for annulment in Las Vegas, claiming she defrauded him into marriage.

We're told after Pam saw the story, Rick's daughter Tyson -- who was living at the home -- had just walked in the door and Pam ordered her to get out. As Tyson got ready to leave, she asked where her dog Bumblebee was, because the pooch was nowhere to be found.

We're told Pam told Tyson she had the dog taken to a boarding facility, but the place says they never had the dog.