Katherine Heigl sued the California-based nonprofit dog rescue The Pitty Committee for breach of contract, defamation and economic sabotage following a soured business partnership between the organization and the actress's animal rescue the Jason Heigl Foundation.

Katherine Heigl, her mother and their animal rescue organization, the Jason Heigl Foundation, filed a lawsuit against California-based dog rescue, The Pitty Committee, on grounds of defamation, attempt to harm 'prospective economic advantage' and breach of contract.

Katherine Heigl talks with us about her practically running a zoo in her home with having over 12 pets to take care of, as well as horses!

Katherine Heigl says her efforts to save animals from death row are being sabotaged by a rogue rescue group that's spreading a whole lot of dog s*** about her foundation ... TMZ has learned.