Commercial dog breeding is very prevalent among Amish and Mennonite farmers, with pockets of Amish dog breeders found throughout the country, including in Lancaster County, Pennsylvania, and parts of Wisconsin.How Many Puppy Mills Exist in the U.S.?At any given point in time, there are typically between 2,000 and 3,000 USDA-licensed breeders (commonly referred to as puppy mills) operating in the U