A new report shows some puppy mills in Nebraska are among the worst in the nation.The Humane Society just published its annual "Horrible Hundred," with four breeders from the state appearing on this year's list.The view the full report, click here.The breeders listed in the report are in Plattsmouth, Malmo, Spencer and Comstock.The reports show puppy mills in those cities were found to have dogs in poor condition or injured, "unacceptable," "unsanitary conditions" or "inadequate cleanliness" for facilities, and no veterinary care plan present, among other citations and violations.Thirteen Iowa dog breeders appear on this year's list. Ohio also has 13.Missouri is number one with 31 confirmed puppy mills.Get the latest headlines from KETV NewsWatch 7