Summary: The plaintiffs, including retail pet stores and a USDA-licensed breeder, challenged Maryland's 2021 Pet Store Statute, which prohibits retail pet stores from selling or transferring dogs and cats, alleging it conflicts with the federal Animal Welfare Act (AWA) and violates the Commerce Clause. The Pet Store Statute aims to curb the sale of dogs from "puppy mills" by banning retail pet stores and brokers from selling dogs, while exempting breeders who sell animals born at their establishments. Plaintiffs argued that the statute effectively shifts dog sales from regulated retail pet stores sourcing from out-of-state breeders to unregulated internet sales and local breeders, undermining the AWA's regulatory framework. The AWA establishes federal standards for the humane treatment of animals, including licensing requirements for breeders and brokers, but explicitly allows states to enact additional animal welfare regulations. The court rejected plaintiffs' claim that the AWA preempts the Pet Store Statute, finding no conflict because the AWA does not occupy the field of animal welfare regulation and permits concurrent state laws. Plaintiffs also argued that the statute obstructs the AWA's objectives by eliminating USDA-licensed brokers from the Maryland market, but the court found no evidence that the statute impedes federal licensing or inspection processes. The court dismissed plaintiffs' Commerce Clause claims, finding no discriminatory purpose or effect against out-of-state breeders, as the statute applies equally to in-state and out-of-state entities and does not prohibit interstate sales. The statute allows out-of-state breeders to sell directly to Maryland consumers, either in person or online, and does not regulate sales occurring wholly outside Maryland. The court upheld the statute's legitimacy, recognizing Maryland's interest in addressing puppy mills, protecting consumers from unhealthy animals, and reducing shelter populations, which are valid state police powers. The court affirmed the dismissal of the complaint, concluding that the Pet Store Statute is not preempted by the AWA and does not violate the Commerce Clause, as it regulates animal welfare within Maryland's traditional authority. The judgment of the district court was affirmed.