Beth Chapman Daughters Sue Over Memorial Fund ... Dog Calls BS

Bonnie Chapman and Cecily Barmore just filed suit against Rainy Robinson -- who was Beth's best friend and costar on "Dog's Most Wanted" -- because they claim she's been running a charity fund baring their mother's name/likeness ... but has been enriching herself instead.

In the suit, obtained by TMZ, Bonnie and Cecily allege Rainy has been soliciting donations for years -- starting shortly after Beth died of cancer in 2019 -- and that, lately, she's been falsely promising to transfer ownership of the fund to the girls, but never actually did it.

That's a big problem for Beth's daughters ... in the suit, they allege Rainy's been acting in bad faith -- never intending to hand over the fund, and instead, starting the process to quietly dissolve the charity.

According to the suit, Rainy made several social media posts about turning over operations of the fund to Bonnie and Cecily, but wen their attorneys demanded an accounting of how she's been using the money ... she reversed course and never followed through on the transfer.

The daughters are suing to block the use of their names and images for the charity and want at least $50K in damages.

Rainy tells TMZ she's been trying to have the girls head the fund since their mom died ... but claims they distanced themselves without explanation. Rainy also says the fund has had good intentions all along, including creating a scholarship and a victim fund for families whose loved ones were murdered.

She also claims she told Bonnie and Cecily they could have the fund, but that they'd need to contact her directly ... which they didn't do. Rainy says she now plans to shut it down.