Legally Blonde 2: Red, White & Blonde (2003)

Elle Woods wants her Chihuahua (dog), Bruiser, to reunite with his mother, because she would like Bruiser's mom to attend her wedding to Emmett. Elle hires a detective to find Bruiser's mother, only to discover that the owner of her dog's mother is C'est Magnifique, a cosmetics company that Animal testing. She finds out that her law firm represents the C'est Magnifique Corporation and when she urges the firm to drop them as a client, she's fired.