A major concern with pet stores and the reason why puppies and kittens may not be sold in certain stores anymore is largely due to puppy mills. Puppy mills are commercial dog breeding businesses that breed dogs primarily for profit, often with little regard for animal welfare. According to the Puppy Mill Project “more than 2. 5 million puppies are born in puppy mills each year” in the United States. Kitten mills are not as widely known as puppy mills, but they still do exist. The animals in these mills are kept in tiny, unsanitary cages, receive little to no nourishment, and often receive no veterinary care. Some cities in Canada, such as Toronto, have altogether banned the sale of cats and dogs in pet stores in order to put an end to this animal abuse.