A puppy mill is a commercial dog breeding facility where many of the pedigree puppies found on sale in pet shops are bred. The puppies are also sold by the puppy mills themselves. The emphasis on profits over the welfare of the animals often leads to substandard, often appalling, living conditions and inevitable suffering, especially for the dogs who are used for breeding.
The poor living conditions, together with frequent inbreeding, mean that many puppies are born with physical abnormalities, genetic flaws and hereditary defects. Many puppies develop behavioural and social problems due to the inappropriate living environments, and from being taken from their mothers at too young an age.
In 2010, the case of a puppy mill at Pasir Ris from which 85 sick and neglected breeding dogs were rescued highlighted the problem of puppy mills in Singapore. Many of the dogs suffered from various serious illnesses including tick fever, skin problems and general neglect. Some of the animals died.