A pet owner who isn't happy with their dog's cut will tell everyone on Nextdoor and Facebook. Place a 'Rate the Groom' QR code on your pickup counter. If the owner has a concern about a specific detail, you can offer a free adjustment on the spot.
By resolving the issue while they are still in the shop, you prevent the 'butcher job' reviews and ensure the owner leaves with a happy pet and a positive view of your business.