A struggling broke ex cop becomes entangled in the underworld when his friend tries to help him by kidnapping a pet which inadvertently belongs to a dreaded gangster and it’s his lucky charm.

Maybe the timing is unfortunate, but this sounds like a movie that's coming out soon :-)
I think your sentence may need polishing, as it comes across as a run-off sentence and is awkward to read. But I think you captured the main character, conflict and quest in your logline.