That's the face of the No. 1 plastic bag consumer in my household. It belongs to Pierogi, my chonky Dachshund mix with googly eyes and punctual bowel movements. Every day at 7 a.m., 2 p.m., and 9 p.m.

From unconditional love to Insta-worthy photos, dog ownership comes with an endless list of perks—but poop duty, alas, is not one of them. Unless your pup consistently does their business in your ...