Yes, someone claims to have invented this:

Abstract A wall-mountable locker to store dog care articles as well as to provide a dispenser for bags to package dog poop, and pegs on which to hang the dog's collar and a leash whereby articles required to care for a particular dog are compactly stored on and in the locker.

The locker includes a backboard on which is mounted a cabinet that is compartmentalized to create a group of cubicles, each of which is dimensioned to accommodate a respective article. Supported on the backboard below the cabinet is a dispenser carrying a roll of plastic poop bags and below the dispenser are the pegs.

This must be one of the few instances of the word "poop" being stored in a federal government database.