The sign is a subtle joke. The shop is called "Stinky's Kittens & Doggies Too." The sign says that the shop is "Stinky's", implying that the shop is owned by someone named "Stinky." So, the Kittens & Doggies are not themselves "Stinky," which is what the poster is implying.
So glad I live in an area with a cooperative power company who actually sends me a ~$40 check every year for overpayment and reimbursement when they saved money