The harms of puppy mills have been well-publicized over the past decade: hundreds of female dogs living out their lives in small cages, producing puppies for sale with each heat cycle, with neither the breeding stock nor puppies receiving normal veterinary care. In popular media, academic critiques, activist publications, and legislative discussion, puppy mills are contrasted with smallvolume dog breeders—the hobby breeder or inadvertent breeder who has only a few dogs and treats them as pets or members of the family, breeding occasionally for personal reasons. Both state and federal laws have been designed to regulate puppy mills and other large-volume dog breeders, specifically excepting smallvolume breeders from regulatory coverage. From...